diff --git a/dlls/crypt32/chain.c b/dlls/crypt32/chain.c
index 147535d45b..03267db076 100644
--- a/dlls/crypt32/chain.c
+++ b/dlls/crypt32/chain.c
@@ -60,7 +60,7 @@ static inline void CRYPT_CloseStores(DWORD cStores, HCERTSTORE *stores)
 
 static const WCHAR rootW[] = { 'R','o','o','t',0 };
 
-BOOL CRYPT_CheckRestrictedRoot(HCERTSTORE store)
+static BOOL CRYPT_CheckRestrictedRoot(HCERTSTORE store)
 {
     BOOL ret = TRUE;