diff --git a/src/fcstr.c b/src/fcstr.c
index 368761d..eaae935 100644
--- a/src/fcstr.c
+++ b/src/fcstr.c
@@ -833,7 +833,7 @@ FcStrBasename (const FcChar8 *file)
     return FcStrCopy (slash + 1);
 }
 
-FcChar8 *
+static FcChar8 *
 FcStrCanonAbsoluteFilename (const FcChar8 *s)
 {
     FcChar8 *file;