diff --git a/lib/isc/unix/include/isc/stdatomic.h b/lib/isc/unix/include/isc/stdatomic.h
index 532d118888..ba5234878e 100644
--- a/lib/isc/unix/include/isc/stdatomic.h
+++ b/lib/isc/unix/include/isc/stdatomic.h
@@ -41,6 +41,8 @@
 #endif
 #endif
 
+#define ATOMIC_VAR_INIT(x)	x
+
 #ifndef __ATOMIC_RELAXED
 #define __ATOMIC_RELAXED        0
 #endif