diff --git a/src/spicelib/devices/nbjt/nbjtdump.c b/src/spicelib/devices/nbjt/nbjtdump.c
index c41822f9e..69b91175f 100644
--- a/src/spicelib/devices/nbjt/nbjtdump.c
+++ b/src/spicelib/devices/nbjt/nbjtdump.c
@@ -69,7 +69,7 @@ NBJTdump(GENmodel *inModel, CKTcircuit *ckt)
 	anyOutput = 1;
 	sprintf(fileName, "%s%s.%d.%s", output->OUTProotFile, prefix,
 	    *state_num, inst->NBJTname);
-	if ((fpState = fopen(fileName, "w")) == NULL) {
+	if ((fpState = fopen(fileName, "wb")) == NULL) {
 	  perror(fileName);
 	} else {
 	  NBJTputHeader(fpState, ckt, inst);
diff --git a/src/spicelib/devices/nbjt2/nbt2dump.c b/src/spicelib/devices/nbjt2/nbt2dump.c
index fbf32bdaf..93329812f 100644
--- a/src/spicelib/devices/nbjt2/nbt2dump.c
+++ b/src/spicelib/devices/nbjt2/nbt2dump.c
@@ -70,7 +70,7 @@ NBJT2dump(GENmodel *inModel, CKTcircuit *ckt)
 	anyOutput = 1;
 	sprintf(fileName, "%s%s.%d.%s", output->OUTProotFile, prefix,
 	    *state_num, inst->NBJT2name);
-	if ((fpState = fopen(fileName, "w")) == NULL) {
+	if ((fpState = fopen(fileName, "wb")) == NULL) {
 	  perror(fileName);
 	} else {
 	  NBJT2putHeader(fpState, ckt, inst);
diff --git a/src/spicelib/devices/numd/numddump.c b/src/spicelib/devices/numd/numddump.c
index 8e08f632c..83bd98a3d 100644
--- a/src/spicelib/devices/numd/numddump.c
+++ b/src/spicelib/devices/numd/numddump.c
@@ -69,7 +69,7 @@ NUMDdump(GENmodel *inModel, CKTcircuit *ckt)
 	anyOutput = 1;
 	sprintf(fileName, "%s%s.%d.%s", output->OUTProotFile, prefix,
 	    *state_num, inst->NUMDname);
-	if ((fpState = fopen(fileName, "w")) == NULL) {
+	if ((fpState = fopen(fileName, "wb")) == NULL) {
 	  perror(fileName);
 	} else {
 	  NUMDputHeader(fpState, ckt, inst);
diff --git a/src/spicelib/devices/numd2/nud2dump.c b/src/spicelib/devices/numd2/nud2dump.c
index 0ea1bf58b..697d9c2f5 100644
--- a/src/spicelib/devices/numd2/nud2dump.c
+++ b/src/spicelib/devices/numd2/nud2dump.c
@@ -70,7 +70,7 @@ NUMD2dump(GENmodel *inModel, CKTcircuit *ckt)
 	anyOutput = 1;
 	sprintf(fileName, "%s%s.%d.%s", output->OUTProotFile, prefix,
 	    *state_num, inst->NUMD2name);
-	if ((fpState = fopen(fileName, "w")) == NULL) {
+	if ((fpState = fopen(fileName, "wb")) == NULL) {
 	  perror(fileName);
 	} else {
 	  NUMD2putHeader(fpState, ckt, inst);
diff --git a/src/spicelib/devices/numos/nummdump.c b/src/spicelib/devices/numos/nummdump.c
index 4cc64c722..067db2cc4 100644
--- a/src/spicelib/devices/numos/nummdump.c
+++ b/src/spicelib/devices/numos/nummdump.c
@@ -70,7 +70,7 @@ NUMOSdump(GENmodel *inModel, CKTcircuit *ckt)
 	anyOutput = 1;
 	sprintf(fileName, "%s%s.%d.%s", output->OUTProotFile, prefix,
 	    *state_num, inst->NUMOSname);
-	if ((fpState = fopen(fileName, "w")) == NULL) {
+	if ((fpState = fopen(fileName, "wb")) == NULL) {
 	  perror(fileName);
 	} else {
 	  NUMOSputHeader(fpState, ckt, inst);