diff --git a/app/src/main/java/gr/thmmy/mthmmy/activities/profile/ProfileActivity.java b/app/src/main/java/gr/thmmy/mthmmy/activities/profile/ProfileActivity.java
index a83fc610..2be05a74 100644
--- a/app/src/main/java/gr/thmmy/mthmmy/activities/profile/ProfileActivity.java
+++ b/app/src/main/java/gr/thmmy/mthmmy/activities/profile/ProfileActivity.java
@@ -124,9 +124,9 @@ public class ProfileActivity extends BaseActivity implements LatestPostsFragment
                     .resize(THUMBNAIL_SIZE, THUMBNAIL_SIZE)
                     .centerCrop()
                     .error(ResourcesCompat.getDrawable(this.getResources()
-                            , R.drawable.ic_default_user_thumbnail, null))
+                            , R.drawable.ic_default_user_thumbnail_white_24dp, null))
                     .placeholder(ResourcesCompat.getDrawable(this.getResources()
-                            , R.drawable.ic_default_user_thumbnail, null))
+                            , R.drawable.ic_default_user_thumbnail_white_24dp, null))
                     .transform(new CircleTransform())
                     .into(thumbnailView);
         usernameView = findViewById(R.id.profile_activity_username);
@@ -310,9 +310,9 @@ public class ProfileActivity extends BaseActivity implements LatestPostsFragment
                         .resize(THUMBNAIL_SIZE, THUMBNAIL_SIZE)
                         .centerCrop()
                         .error(ResourcesCompat.getDrawable(getResources()
-                                , R.drawable.ic_default_user_thumbnail, null))
+                                , R.drawable.ic_default_user_thumbnail_white_24dp, null))
                         .placeholder(ResourcesCompat.getDrawable(getResources()
-                                , R.drawable.ic_default_user_thumbnail, null))
+                                , R.drawable.ic_default_user_thumbnail_white_24dp, null))
                         .transform(new CircleTransform())
                         .into(thumbnailView);
             if (personalText != null) {
diff --git a/app/src/main/java/gr/thmmy/mthmmy/activities/topic/TopicAdapter.java b/app/src/main/java/gr/thmmy/mthmmy/activities/topic/TopicAdapter.java
index 650c8d34..520da629 100644
--- a/app/src/main/java/gr/thmmy/mthmmy/activities/topic/TopicAdapter.java
+++ b/app/src/main/java/gr/thmmy/mthmmy/activities/topic/TopicAdapter.java
@@ -204,9 +204,9 @@ class TopicAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
                     .resize(THUMBNAIL_SIZE, THUMBNAIL_SIZE)
                     .centerCrop()
                     .error(ResourcesCompat.getDrawable(context.getResources()
-                            , R.drawable.ic_default_user_thumbnail, null))
+                            , R.drawable.ic_default_user_thumbnail_white_24dp, null))
                     .placeholder(ResourcesCompat.getDrawable(context.getResources()
-                            , R.drawable.ic_default_user_thumbnail, null))
+                            , R.drawable.ic_default_user_thumbnail_white_24dp, null))
                     .transform(new CircleTransform())
                     .into(holder.thumbnail);
 
@@ -512,9 +512,9 @@ class TopicAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
                     .resize(THUMBNAIL_SIZE, THUMBNAIL_SIZE)
                     .centerCrop()
                     .error(ResourcesCompat.getDrawable(context.getResources()
-                            , R.drawable.ic_default_user_thumbnail, null))
+                            , R.drawable.ic_default_user_thumbnail_white_24dp, null))
                     .placeholder(ResourcesCompat.getDrawable(context.getResources()
-                            , R.drawable.ic_default_user_thumbnail, null))
+                            , R.drawable.ic_default_user_thumbnail_white_24dp, null))
                     .transform(new CircleTransform())
                     .into(holder.thumbnail);
             holder.username.setText(getSessionManager().getUsername());
diff --git a/app/src/main/res/drawable/ic_default_user_thumbnail.png b/app/src/main/res/drawable/ic_default_user_thumbnail.png
deleted file mode 100644
index 0803edc6..00000000
Binary files a/app/src/main/res/drawable/ic_default_user_thumbnail.png and /dev/null differ
diff --git a/app/src/main/res/drawable/ic_default_user_thumbnail_white_24dp.xml b/app/src/main/res/drawable/ic_default_user_thumbnail_white_24dp.xml
new file mode 100644
index 00000000..d7366bda
--- /dev/null
+++ b/app/src/main/res/drawable/ic_default_user_thumbnail_white_24dp.xml
@@ -0,0 +1,5 @@
+<vector android:height="24dp" android:tint="#FFFFFF"
+    android:viewportHeight="24.0" android:viewportWidth="24.0"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M12,12c2.21,0 4,-1.79 4,-4s-1.79,-4 -4,-4 -4,1.79 -4,4 1.79,4 4,4zM12,14c-2.67,0 -8,1.34 -8,4v2h16v-2c0,-2.66 -5.33,-4 -8,-4z"/>
+</vector>
diff --git a/app/src/main/res/layout-v21/activity_profile.xml b/app/src/main/res/layout-v21/activity_profile.xml
index 21a187bd..22f819cc 100644
--- a/app/src/main/res/layout-v21/activity_profile.xml
+++ b/app/src/main/res/layout-v21/activity_profile.xml
@@ -41,7 +41,7 @@
                     android:adjustViewBounds="true"
                     android:contentDescription="@string/post_thumbnail"
                     android:fitsSystemWindows="true"
-                    android:src="@drawable/ic_default_user_thumbnail"
+                    app:srcCompat="@drawable/ic_default_user_thumbnail_white_24dp"
                     android:transitionName="user_thumbnail"
                     app:layout_collapseMode="parallax"/>
 
diff --git a/app/src/main/res/layout-v21/activity_topic_post_row.xml b/app/src/main/res/layout-v21/activity_topic_post_row.xml
index 3dce9de5..e4363a19 100644
--- a/app/src/main/res/layout-v21/activity_topic_post_row.xml
+++ b/app/src/main/res/layout-v21/activity_topic_post_row.xml
@@ -60,7 +60,7 @@
                             android:contentDescription="@string/post_thumbnail"
                             android:maxHeight="@dimen/thumbnail_size"
                             android:maxWidth="@dimen/thumbnail_size"
-                            android:src="@drawable/ic_default_user_thumbnail"
+                            app:srcCompat="@drawable/ic_default_user_thumbnail_white_24dp"
                             android:transitionName="user_thumbnail" />
                     </FrameLayout>
 
diff --git a/app/src/main/res/layout/activity_profile.xml b/app/src/main/res/layout/activity_profile.xml
index 81b3aea7..dcd3770c 100644
--- a/app/src/main/res/layout/activity_profile.xml
+++ b/app/src/main/res/layout/activity_profile.xml
@@ -41,7 +41,7 @@
                     android:adjustViewBounds="true"
                     android:contentDescription="@string/post_thumbnail"
                     android:fitsSystemWindows="true"
-                    android:src="@drawable/ic_default_user_thumbnail"
+                    app:srcCompat="@drawable/ic_default_user_thumbnail_white_24dp"
                     app:layout_collapseMode="parallax"/>
 
                 <TextView
diff --git a/app/src/main/res/layout/activity_topic_post_row.xml b/app/src/main/res/layout/activity_topic_post_row.xml
index eaed8aca..83c33bb2 100644
--- a/app/src/main/res/layout/activity_topic_post_row.xml
+++ b/app/src/main/res/layout/activity_topic_post_row.xml
@@ -60,7 +60,7 @@
                             android:contentDescription="@string/post_thumbnail"
                             android:maxHeight="@dimen/thumbnail_size"
                             android:maxWidth="@dimen/thumbnail_size"
-                            android:src="@drawable/ic_default_user_thumbnail" />
+                            app:srcCompat="@drawable/ic_default_user_thumbnail_white_24dp" />
                     </FrameLayout>
 
                     <TextView
diff --git a/app/src/main/res/layout/activity_topic_quick_reply_row.xml b/app/src/main/res/layout/activity_topic_quick_reply_row.xml
index ce7e24ab..7702994c 100644
--- a/app/src/main/res/layout/activity_topic_quick_reply_row.xml
+++ b/app/src/main/res/layout/activity_topic_quick_reply_row.xml
@@ -53,7 +53,7 @@
                         android:contentDescription="@string/post_thumbnail"
                         android:maxHeight="@dimen/thumbnail_size"
                         android:maxWidth="@dimen/thumbnail_size"
-                        android:src="@drawable/ic_default_user_thumbnail" />
+                        app:srcCompat="@drawable/ic_default_user_thumbnail_white_24dp" />
                 </FrameLayout>
 
                 <TextView