diff --git a/src/include/ngspice/defines.h b/src/include/ngspice/defines.h
index 66ce42375..d5dadd650 100644
--- a/src/include/ngspice/defines.h
+++ b/src/include/ngspice/defines.h
@@ -69,6 +69,7 @@
 #define DIR_CWD             "."
 
 #define TEMPFORMAT          "%s%d.tmp"
+#define TEMPFORMAT2         "%s%d_%d.tmp"
 
 /*
 #define SYSTEM_PLOT5LPR     "lpr -P%s -g %s"
@@ -82,6 +83,7 @@
 #define DIR_CWD             "."
 
 #define TEMPFORMAT          "/tmp/%s%d"
+#define TEMPFORMAT2         "/tmp/%s%d_%d"
 #define SYSTEM_PLOT5LPR     "lpr -P%s -g %s"
 #define SYSTEM_PSLPR        "lpr -P%s %s"
 #define SYSTEM_MAIL         "Mail -s \"%s (%s) Bug Report\" %s"
diff --git a/src/misc/mktemp.c b/src/misc/mktemp.c
index 5b5b48f28..53af275ec 100644
--- a/src/misc/mktemp.c
+++ b/src/misc/mktemp.c
@@ -18,8 +18,10 @@ Copyright 1990 Regents of the University of California.  All rights reserved.
 #ifndef TEMPFORMAT
 #define TEMPFORMAT "temp%s%d"
 #endif
+#ifndef TEMPFORMAT2
+#define TEMPFORMAT "temp%s%d_%d"
+#endif
 
-#define TEMPFORMAT2 "%s%d_%d.tmp"
 
 char *
 smktemp(char *id)