diff --git a/src/spicelib/devices/hisim2/hsm2init.c b/src/spicelib/devices/hisim2/hsm2init.c
index 6ed0f9e8a..28c526e2f 100644
--- a/src/spicelib/devices/hisim2/hsm2init.c
+++ b/src/spicelib/devices/hisim2/hsm2init.c
@@ -1,3 +1,5 @@
+#include "ngspice/config.h"
+
 #include "ngspice/devdefs.h"
 
 #include "hsm2def.h"