diff --git a/cbt.h b/cbt.h
index c1f5ff1..75c6ed6 100644
--- a/cbt.h
+++ b/cbt.h
@@ -239,7 +239,7 @@ void cbt__init(int argc, char **argv, const char *source_file) {
   cbt_log(CBT_LOG_INFO, "Found C Compiler: %s", cbt_cc);
 
 #ifdef __APPLE__
-  CBT_FAIL(proc_pidpath(getpid(), cbt_location, PATH_MAX) != 0);
+  CBT_FAIL(proc_pidpath(getpid(), cbt_location, PATH_MAX) == -1);
 #else
   CBT_FAIL(readlink("/proc/self/exe", cbt_location, PATH_MAX) == -1);
 #endif