diff --git a/src/main.zig b/src/main.zig
index c73e8acaf87bebd7217c5c281ef100c04800dcdb..1db5693e36e6e792d9499a829cf60c6e2e333506 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -1406,6 +1406,8 @@ fn buildOutputType(
             }
         },
         .cc, .cpp => {
+            if (build_options.only_c) unreachable;
+
             emit_h = .no;
             soname = .no;
             ensure_libc_on_non_freestanding = true;