diff --git a/src/xspice/icm/digital/d_osc/cfunc.mod b/src/xspice/icm/digital/d_osc/cfunc.mod
index b76386132..567b405cf 100644
--- a/src/xspice/icm/digital/d_osc/cfunc.mod
+++ b/src/xspice/icm/digital/d_osc/cfunc.mod
@@ -20,6 +20,7 @@ MODIFICATIONS
     23 Aug 1991    Jeffrey P. Murray
     30 Sep 1991    Jeffrey P. Murray
     09 Nov 2022    Holger Vogt
+    05 Jan 2023    Robert Turnbull
 
 SUMMARY
 
@@ -54,7 +55,7 @@ NON-STANDARD FEATURES
 
 #include "d_osc.h"    /*    ...contains macros & type defns.
                                for this model.  7/24/91 - JPM */
-
+#include <stdlib.h>
 
 
 /*=== CONSTANTS ========================*/
diff --git a/src/xspice/icm/digital/d_pwm/cfunc.mod b/src/xspice/icm/digital/d_pwm/cfunc.mod
index e64d6efcd..3d73e4ced 100644
--- a/src/xspice/icm/digital/d_pwm/cfunc.mod
+++ b/src/xspice/icm/digital/d_pwm/cfunc.mod
@@ -20,6 +20,7 @@ MODIFICATIONS
     23 Aug 1991    Jeffrey P. Murray
     30 Sep 1991    Jeffrey P. Murray
     06 Oct 2022    Holger Vogt
+    05 Jan 2023    Robert Turnbull
 
 SUMMARY
 
@@ -54,6 +55,7 @@ NON-STANDARD FEATURES
 
 #include "d_pwm.h"    /*    ...contains macros & type defns.
                                for this model.  7/24/91 - JPM */
+#include <stdlib.h>