diff --git a/configure b/configure
index 990f1f9d610..ad2ef2e7b8d 100755
--- a/configure
+++ b/configure
@@ -17498,7 +17498,7 @@ fi
 CPPFLAGS=$ac_save_CPPFLAGS
 
 fi
-if test "x$ac_cv_lib_capi20_capi20_register" = "x"
+if test "x$ac_cv_lib_capi20_capi20_register" != xyes
 then :
   case "x$with_capi" in
   x)   as_fn_append wine_notices "|libcapi20 ${notice_platform}development files not found, ISDN won't be supported." ;;
diff --git a/configure.ac b/configure.ac
index 445d3048198..4245f7efb0f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1667,7 +1667,7 @@ then
         AC_CHECK_LIB(capi20,capi20_register,[:],[CAPI20_LIBS=""],[$CAPI20_LIBS])
     fi])
 fi
-WINE_NOTICE_WITH(capi,[test "x$ac_cv_lib_capi20_capi20_register" = "x"],
+WINE_NOTICE_WITH(capi,[test "x$ac_cv_lib_capi20_capi20_register" != xyes],
                  [libcapi20 ${notice_platform}development files not found, ISDN won't be supported.],
                  [enable_capi2032])