diff --git a/src/add-ons/accelerants/matrox/Overlay.c b/src/add-ons/accelerants/matrox/Overlay.c
index 1f269521ee..77fe95a7d3 100644
--- a/src/add-ons/accelerants/matrox/Overlay.c
+++ b/src/add-ons/accelerants/matrox/Overlay.c
@@ -1,4 +1,4 @@
-/* Written by Rudolf Cornelissen 05-2002/03-2003 */
+/* Written by Rudolf Cornelissen 05-2002/4-2006 */
 
 /* Note on 'missing features' in BeOS 5.0.3 and DANO:
  * BeOS needs to define more colorspaces! It would be nice if BeOS would support the FourCC 'definitions'
@@ -47,7 +47,7 @@ const uint32 *OVERLAY_SUPPORTED_SPACES(const display_mode *dm)
 	}
 
 	/* interlaced VGA is not supported by G200-G550 BES */
-	if (dm->timing.flags && B_TIMING_INTERLACED)
+	if (dm->timing.flags & B_TIMING_INTERLACED)
 	{
 		return NULL;
 	}
diff --git a/src/add-ons/accelerants/neomagic/Overlay.c b/src/add-ons/accelerants/neomagic/Overlay.c
index 035aab6461..98a5919493 100644
--- a/src/add-ons/accelerants/neomagic/Overlay.c
+++ b/src/add-ons/accelerants/neomagic/Overlay.c
@@ -1,4 +1,4 @@
-/* Written by Rudolf Cornelissen 05-2002/08-2004 */
+/* Written by Rudolf Cornelissen 05-2002/4-2006 */
 
 /* Note on 'missing features' in BeOS 5.0.3 and DANO:
  * BeOS needs to define more colorspaces! It would be nice if BeOS would support the FourCC 'definitions'
@@ -41,7 +41,7 @@ const uint32 *OVERLAY_SUPPORTED_SPACES(const display_mode *dm)
 	}
 
 	/* assuming interlaced VGA is not supported */
-	if (dm->timing.flags && B_TIMING_INTERLACED)
+	if (dm->timing.flags & B_TIMING_INTERLACED)
 	{
 		return NULL;
 	}
diff --git a/src/add-ons/accelerants/nvidia/Overlay.c b/src/add-ons/accelerants/nvidia/Overlay.c
index cbeb8cb4a6..30d37420a6 100644
--- a/src/add-ons/accelerants/nvidia/Overlay.c
+++ b/src/add-ons/accelerants/nvidia/Overlay.c
@@ -1,4 +1,4 @@
-/* Written by Rudolf Cornelissen 05/2002-2/2006 */
+/* Written by Rudolf Cornelissen 05/2002-4/2006 */
 
 /* Note on 'missing features' in BeOS 5.0.3 and DANO:
  * BeOS needs to define more colorspaces! It would be nice if BeOS would support the FourCC 'definitions'
@@ -43,7 +43,7 @@ const uint32 *OVERLAY_SUPPORTED_SPACES(const display_mode *dm)
 	}
 
 	/* assuming interlaced VGA is not supported */
-	if (dm->timing.flags && B_TIMING_INTERLACED)
+	if (dm->timing.flags & B_TIMING_INTERLACED)
 	{
 		return NULL;
 	}
diff --git a/src/add-ons/accelerants/skeleton/Overlay.c b/src/add-ons/accelerants/skeleton/Overlay.c
index 99e1243b15..a22be49b6b 100644
--- a/src/add-ons/accelerants/skeleton/Overlay.c
+++ b/src/add-ons/accelerants/skeleton/Overlay.c
@@ -1,4 +1,4 @@
-/* Written by Rudolf Cornelissen 05/2002-9/2004 */
+/* Written by Rudolf Cornelissen 05/2002-4/2006 */
 
 /* Note on 'missing features' in BeOS 5.0.3 and DANO:
  * BeOS needs to define more colorspaces! It would be nice if BeOS would support the FourCC 'definitions'
@@ -43,7 +43,7 @@ const uint32 *OVERLAY_SUPPORTED_SPACES(const display_mode *dm)
 	}
 
 	/* assuming interlaced VGA is not supported */
-	if (dm->timing.flags && B_TIMING_INTERLACED)
+	if (dm->timing.flags & B_TIMING_INTERLACED)
 	{
 		return NULL;
 	}
diff --git a/src/add-ons/accelerants/via/Overlay.c b/src/add-ons/accelerants/via/Overlay.c
index 0846d03708..fa2d589b9b 100644
--- a/src/add-ons/accelerants/via/Overlay.c
+++ b/src/add-ons/accelerants/via/Overlay.c
@@ -1,4 +1,4 @@
-/* Written by Rudolf Cornelissen 05/2002-9/2005 */
+/* Written by Rudolf Cornelissen 05/2002-4/2006 */
 
 /* Note on 'missing features' in BeOS 5.0.3 and DANO:
  * BeOS needs to define more colorspaces! It would be nice if BeOS would support the FourCC 'definitions'
@@ -43,7 +43,7 @@ const uint32 *OVERLAY_SUPPORTED_SPACES(const display_mode *dm)
 	}
 
 	/* assuming interlaced VGA is not supported */
-	if (dm->timing.flags && B_TIMING_INTERLACED)
+	if (dm->timing.flags & B_TIMING_INTERLACED)
 	{
 		return NULL;
 	}