diff --git a/usr.bin/truss/amd64-fbsd.c b/usr.bin/truss/amd64-fbsd.c
index 701813b9e0c5..49d78806612e 100644
--- a/usr.bin/truss/amd64-fbsd.c
+++ b/usr.bin/truss/amd64-fbsd.c
@@ -242,7 +242,8 @@ amd64_syscall_entry(struct trussinfo *trussinfo, int nargs) {
    * parameter?
    */
 
-  if (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit")) {
+  if (fsc.name != NULL &&
+      (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
 
     /* XXX
      * This could be done in a more general
diff --git a/usr.bin/truss/amd64-linux32.c b/usr.bin/truss/amd64-linux32.c
index 983382985343..42b49ec7d4f5 100644
--- a/usr.bin/truss/amd64-linux32.c
+++ b/usr.bin/truss/amd64-linux32.c
@@ -219,7 +219,8 @@ i386_linux_syscall_entry(struct trussinfo *trussinfo, int nargs) {
    * parameter?
    */
 
-  if (!strcmp(fsc.name, "linux_execve") || !strcmp(fsc.name, "exit")) {
+  if (fsc.name != NULL &&
+      (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
 
     /* XXX
      * This could be done in a more general
diff --git a/usr.bin/truss/i386-linux.c b/usr.bin/truss/i386-linux.c
index 983382985343..42b49ec7d4f5 100644
--- a/usr.bin/truss/i386-linux.c
+++ b/usr.bin/truss/i386-linux.c
@@ -219,7 +219,8 @@ i386_linux_syscall_entry(struct trussinfo *trussinfo, int nargs) {
    * parameter?
    */
 
-  if (!strcmp(fsc.name, "linux_execve") || !strcmp(fsc.name, "exit")) {
+  if (fsc.name != NULL &&
+      (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
 
     /* XXX
      * This could be done in a more general
diff --git a/usr.bin/truss/ia64-fbsd.c b/usr.bin/truss/ia64-fbsd.c
index 10fcd6202f46..e233505ec951 100644
--- a/usr.bin/truss/ia64-fbsd.c
+++ b/usr.bin/truss/ia64-fbsd.c
@@ -223,7 +223,8 @@ ia64_syscall_entry(struct trussinfo *trussinfo, int nargs) {
    * parameter?
    */
 
-  if (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit")) {
+  if (fsc.name != NULL &&
+      (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
 
     /* XXX
      * This could be done in a more general
diff --git a/usr.bin/truss/sparc64-fbsd.c b/usr.bin/truss/sparc64-fbsd.c
index d30dc236f1e4..ff5073d8148b 100644
--- a/usr.bin/truss/sparc64-fbsd.c
+++ b/usr.bin/truss/sparc64-fbsd.c
@@ -259,7 +259,8 @@ sparc64_syscall_entry(struct trussinfo *trussinfo, int nargs) {
    * parameter?
    */
 
-  if (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit")) {
+  if (fsc.name != NULL &&
+      (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
 
     /* XXX
      * This could be done in a more general