diff --git a/app/src/main/java/org/linphone/utils/DialogUtils.kt b/app/src/main/java/org/linphone/utils/DialogUtils.kt
index 9186e3835..002e48b16 100644
--- a/app/src/main/java/org/linphone/utils/DialogUtils.kt
+++ b/app/src/main/java/org/linphone/utils/DialogUtils.kt
@@ -353,7 +353,7 @@ class DialogUtils {
                 val d: Drawable = ColorDrawable(
                     context.getColor(R.color.black)
                 )
-                d.alpha = 153 // 60%
+                d.alpha = 153 // 60% opacity
                 setBackgroundDrawable(d)
             }
 
diff --git a/app/src/main/res/layout/operation_in_progress.xml b/app/src/main/res/layout/operation_in_progress.xml
index 30afb80b7..1dd15e1fe 100644
--- a/app/src/main/res/layout/operation_in_progress.xml
+++ b/app/src/main/res/layout/operation_in_progress.xml
@@ -12,8 +12,7 @@
     <androidx.constraintlayout.widget.ConstraintLayout
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:background="?attr/color_grey_300"
-        android:alpha="102"
+        android:background="@color/dialog_background"
         android:visibility="@{visibility ? View.VISIBLE : View.GONE, default=gone}">
 
         <ImageView
diff --git a/app/src/main/res/values/colors.xml b/app/src/main/res/values/colors.xml
index d0eca19bb..56f196a0b 100644
--- a/app/src/main/res/values/colors.xml
+++ b/app/src/main/res/values/colors.xml
@@ -3,6 +3,7 @@
     <color name="transparent_color">#00000000</color>
     <color name="black">#000000</color>
     <color name="white">#FFFFFF</color>
+    <color name="dialog_background">#99000000</color><!-- 60% opacity -->
 
     <color name="orange_main_100">#FFEACB</color>
     <color name="orange_main_100_alpha_50">#80FFEACB</color>