diff --git a/sys/arm/include/pmap.h b/sys/arm/include/pmap.h
index 5debffcef51..b2ae2201993 100644
--- a/sys/arm/include/pmap.h
+++ b/sys/arm/include/pmap.h
@@ -30,6 +30,7 @@
 #ifndef _MACHINE_PMAP_H_
 #define _MACHINE_PMAP_H_
 
+#include <sys/systm.h>
 #if __ARM_ARCH >= 6
 #include <machine/pmap-v6.h>
 #else