diff --git a/Intel8080/src/stdafx.h b/Intel8080/src/stdafx.h
index 414a1a4..d77c746 100644
--- a/Intel8080/src/stdafx.h
+++ b/Intel8080/src/stdafx.h
@@ -1,4 +1,6 @@
+#ifdef _MSC_VER
 #pragma once
+#endif
 
 #include <cstdint>
 #include <functional>
diff --git a/src/stdafx.h b/src/stdafx.h
index 19d92f2..31d6609 100644
--- a/src/stdafx.h
+++ b/src/stdafx.h
@@ -1,4 +1,6 @@
+#ifdef _MSC_VER
 #pragma once
+#endif
 
 #include <cstdint>
 #include <functional>