diff --git a/src/common/FBSurfaceSDL2.cxx b/src/common/FBSurfaceSDL2.cxx
index 3a3d92673..7f3ee70a7 100644
--- a/src/common/FBSurfaceSDL2.cxx
+++ b/src/common/FBSurfaceSDL2.cxx
@@ -47,8 +47,12 @@ FBSurfaceSDL2::FBSurfaceSDL2(FrameBufferSDL2& buffer,
   : myFB(buffer),
     myInterpolationMode(interpolation),
     mySurface(nullptr),
+    mySrcR({0, 0, 0, 0}),
+    myDstR({0, 0, 0, 0}),
     myIsVisible(true),
-    myIsStatic(false)
+    myIsStatic(false),
+    mySrcGUIR({0, 0, 0, 0}),
+    myDstGUIR({0, 0, 0, 0})
 {
   createSurface(width, height, data);
 }
diff --git a/src/common/sdl_blitter/BilinearBlitter.cxx b/src/common/sdl_blitter/BilinearBlitter.cxx
index e92714159..689ce8170 100644
--- a/src/common/sdl_blitter/BilinearBlitter.cxx
+++ b/src/common/sdl_blitter/BilinearBlitter.cxx
@@ -21,6 +21,8 @@
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 BilinearBlitter::BilinearBlitter(FrameBufferSDL2& fb, bool interpolate) :
+  mySrcRect({0, 0, 0, 0}),
+  myDstRect({0, 0, 0, 0}),
   myTexture(nullptr),
   mySecondaryTexture(nullptr),
   myInterpolate(interpolate),
diff --git a/src/common/sdl_blitter/QisBlitter.cxx b/src/common/sdl_blitter/QisBlitter.cxx
index b4c2a6750..69f3bfa5d 100644
--- a/src/common/sdl_blitter/QisBlitter.cxx
+++ b/src/common/sdl_blitter/QisBlitter.cxx
@@ -21,6 +21,8 @@
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 QisBlitter::QisBlitter(FrameBufferSDL2& fb) :
+  mySrcRect({0, 0, 0, 0}),
+  myDstRect({0, 0, 0, 0}),
   mySrcTexture(nullptr),
   myIntermediateTexture(nullptr),
   mySecondaryIntermedateTexture(nullptr),