diff --git a/src/engine/SplitP.h b/src/engine/SplitP.h
index 2b61c9a520..6d51e3c599 100644
--- a/src/engine/SplitP.h
+++ b/src/engine/SplitP.h
@@ -149,7 +149,7 @@ void  xaccFreeSplit (Split *split);    /* frees memory */
 Split * xaccSplitClone (const Split *s);
 
 Split *xaccDupeSplit (const Split *s);
-G_INLINE_FUNC void mark_split (Split *s);
+void mark_split (Split *s);
 
 void xaccSplitVoid(Split *split);
 void xaccSplitUnvoid(Split *split);