diff --git a/m4/curl-wolfssl.m4 b/m4/curl-wolfssl.m4
index 9e09be7fea..48812e724d 100644
--- a/m4/curl-wolfssl.m4
+++ b/m4/curl-wolfssl.m4
@@ -32,7 +32,7 @@ case "$OPT_WOLFSSL" in
     wolfpkg=""
     ;;
   *)
-    wolfpkg="$withval/lib/pkgconfig"
+    wolfpkg="$OPT_WOLFSSL/lib/pkgconfig"
     ;;
 esac