diff --git a/BasiliskII/src/Unix/video_blit.h b/BasiliskII/src/Unix/video_blit.h
index e9126edd..e6b218fa 100644
--- a/BasiliskII/src/Unix/video_blit.h
+++ b/BasiliskII/src/Unix/video_blit.h
@@ -43,6 +43,10 @@ static void FB_FUNC_NAME(uint8 * dest, const uint8 * source, uint32 length)
 	// source and dest are mutually aligned
 	uint16 * swp = ((uint16 *)source);
 	uint16 * dwp = ((uint16 *) dest );
+
+#if FB_DEPTH <= 8
+	if (length >= 2) {
+#endif
 	
 #if FB_DEPTH <= 16
 	// Align source and dest to 32-bit word boundaries
@@ -83,6 +87,10 @@ static void FB_FUNC_NAME(uint8 * dest, const uint8 * source, uint32 length)
 		FB_BLIT_1(*d, *s);
 	}
 #endif
+	
+#if FB_DEPTH <= 8
+	}
+#endif
 }
 
 #undef FB_FUNC_NAME