diff --git a/fb/fb.h b/fb/fb.h
index 700329b68..f63999baf 100644
--- a/fb/fb.h
+++ b/fb/fb.h
@@ -110,8 +110,6 @@ typedef FbBits FbStip;
 typedef int FbStride;
 
 #ifdef FB_DEBUG
-extern _X_EXPORT void fbSetBits(FbStip * bits, int stride, FbStip data);
-
 #define FB_HEAD_BITS   (FbStip) (0xbaadf00d)
 #define FB_TAIL_BITS   (FbStip) (0xbaddf0ad)
 #endif
diff --git a/fb/fb_priv.h b/fb/fb_priv.h
index 7ff634a62..800e796df 100644
--- a/fb/fb_priv.h
+++ b/fb/fb_priv.h
@@ -10,6 +10,7 @@
 #ifdef FB_DEBUG
 
 void fbValidateDrawable(DrawablePtr d);
+void fbSetBits(FbStip * bits, int stride, FbStip data);
 
 #else