diff --git a/js/src/shell/js.cpp b/js/src/shell/js.cpp
index 36e65c78ad6f..d839060f9752 100644
--- a/js/src/shell/js.cpp
+++ b/js/src/shell/js.cpp
@@ -7133,7 +7133,7 @@ PreInit()
 {
 #ifdef XP_WIN
     const char* crash_option = getenv("XRE_NO_WINDOWS_CRASH_DIALOG");
-    if (crash_option && strncmp(crash_option, "1", 1)) {
+    if (crash_option && crash_option[0] == '1') {
         // Disable the segfault dialog. We want to fail the tests immediately
         // instead of hanging automation.
         UINT newMode = SEM_NOGPFAULTERRORBOX | SEM_NOOPENFILEERRORBOX;