diff --git a/build/autoconf/compiler-opts.m4 b/build/autoconf/compiler-opts.m4
index d4016b6099..c47d792f41 100644
--- a/build/autoconf/compiler-opts.m4
+++ b/build/autoconf/compiler-opts.m4
@@ -181,9 +181,7 @@ if test "$GNU_CC"; then
 
     if test -z "$CLANG_CC"; then
         case "$CC_VERSION" in
-        4.*)
-            ;;
-        5.*)
+        4.* | 5.*)
             ;;
         *)
             # Lifetime Dead Store Elimination level 2 (default in GCC6+) breaks Gecko.