diff --git a/src/libunicode/emoji_presentation_scanner.c b/src/libunicode/emoji_presentation_scanner.c
index aaa3acf..496b8b9 100644
--- a/src/libunicode/emoji_presentation_scanner.c
+++ b/src/libunicode/emoji_presentation_scanner.c
@@ -16,7 +16,9 @@
  */
 
 // clang-format off
+#ifdef __GNUC__
 #pragma GCC diagnostic ignored "-Wsign-conversion"
+#endif
 
 #line 20 "emoji_presentation_scanner.c"
 static const char _emoji_presentation_actions[] = {
diff --git a/src/libunicode/emoji_presentation_scanner.rl b/src/libunicode/emoji_presentation_scanner.rl
index 3fd5049..e21d9bd 100644
--- a/src/libunicode/emoji_presentation_scanner.rl
+++ b/src/libunicode/emoji_presentation_scanner.rl
@@ -14,7 +14,9 @@
  */
 
 // clang-format off
+#ifdef __GNUC__
 #pragma GCC diagnostic ignored "-Wsign-conversion"
+#endif
 
 %%{
   machine emoji_presentation;