diff --git a/src/meta/build_tool.c b/src/meta/build_tool.c
index dfec2ab..2e62ab9 100644
--- a/src/meta/build_tool.c
+++ b/src/meta/build_tool.c
@@ -5123,7 +5123,7 @@ int main(int argument_count, char **arguments) {
     S8_List   list = {0};
     for (int i = 1; i < argument_count; i += 1) {
         S8_String it = S8_MakeFromChar(arguments[i]);
-        if (S8_StartsWith(it, S8_Lit("--compiler="), false)) cc = S8_Skip(it, 3);
+        if (S8_StartsWith(it, S8_Lit("--compiler="), false)) cc = S8_Skip(it, MA_Lengthof("--compiler="));
         S8_AddNode(&Perm, &list, it);
     }
     IO_Printf("compiler=%.*s\n", S8_Expand(cc));