diff --git a/m4/curl-compilers.m4 b/m4/curl-compilers.m4
index 107dc6ab9..b0d5d4213 100644
--- a/m4/curl-compilers.m4
+++ b/m4/curl-compilers.m4
@@ -1119,6 +1119,10 @@ AC_DEFUN([CURL_SET_COMPILER_WARNING_OPTS], [
             fi
           fi
         fi
+        dnl Only gcc 10 or later
+        if test "$compiler_num" -ge "1000"; then
+          CURL_ADD_COMPILER_WARNINGS([tmp_CFLAGS], [enum-conversion])
+        fi
         ;;
         #
       HP_UX_C)