diff --git a/Source/pbobjc/Svga.pbobjc.m b/Source/pbobjc/Svga.pbobjc.m
index 3fd8e4d7..c39f4202 100644
--- a/Source/pbobjc/Svga.pbobjc.m
+++ b/Source/pbobjc/Svga.pbobjc.m
@@ -14,6 +14,7 @@
 #endif
 
 #import "Svga.pbobjc.h"
+#include <libkern/OSAtomic.h>
 // @@protoc_insertion_point(imports)
 
 #pragma clang diagnostic push