diff --git a/c10/metal/special_math.h b/c10/metal/special_math.h
index 7ac056754e9..d78d84cb52b 100644
--- a/c10/metal/special_math.h
+++ b/c10/metal/special_math.h
@@ -1,4 +1,5 @@
 // Implementation of specal math functions for Metal
+#pragma once
 #include <metal_stdlib>
 
 namespace c10 {
diff --git a/c10/metal/utils.h b/c10/metal/utils.h
index fa1b2009428..b73898173de 100644
--- a/c10/metal/utils.h
+++ b/c10/metal/utils.h
@@ -1,3 +1,5 @@
+// Metal helper functions
+#pragma once
 #include <metal_stdlib>
 
 namespace c10 {