diff --git a/usr.bin/truss/amd64-fbsd32.c b/usr.bin/truss/amd64-fbsd32.c
index dac6aa1269cf..45da1cdf3dd4 100644
--- a/usr.bin/truss/amd64-fbsd32.c
+++ b/usr.bin/truss/amd64-fbsd32.c
@@ -236,7 +236,8 @@ i386_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/i386-fbsd.c b/usr.bin/truss/i386-fbsd.c
index dac6aa1269cf..45da1cdf3dd4 100644
--- a/usr.bin/truss/i386-fbsd.c
+++ b/usr.bin/truss/i386-fbsd.c
@@ -236,7 +236,8 @@ i386_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/syscalls.c b/usr.bin/truss/syscalls.c
index 42c2fa6f764e..6bae74ef03d8 100644
--- a/usr.bin/truss/syscalls.c
+++ b/usr.bin/truss/syscalls.c
@@ -165,6 +165,8 @@ struct syscall *
 get_syscall(const char *name) {
 	struct syscall *sc = syscalls;
 
+	if (name == NULL)
+		return (NULL);
 	while (sc->name) {
 		if (!strcmp(name, sc->name))
 			return sc;