diff --git a/dlls/crypt32/encode.c b/dlls/crypt32/encode.c
index 75900124601..29b3a66b1a9 100644
--- a/dlls/crypt32/encode.c
+++ b/dlls/crypt32/encode.c
@@ -2077,7 +2077,7 @@ static BOOL CRYPT_AsnEncodeNumericString(const CERT_NAME_VALUE *value,
     return ret;
 }
 
-static inline int isprintableW(WCHAR wc)
+static inline BOOL isprintableW(WCHAR wc)
 {
     return isalnumW(wc) || isspaceW(wc) || wc == '\'' || wc == '(' ||
      wc == ')' || wc == '+' || wc == ',' || wc == '-' || wc == '.' ||