diff --git a/src/main.cpp b/src/main.cpp
index bc3b48453..176579b90 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -3012,15 +3012,15 @@ int main(int argc, const char * argv[]) {
 		char buff[PATH_MAX+1];
 		ssize_t len = -1;
 #if defined(__APPLE__)
-		uint32_t bufsize = sizeof(buff) - 1;
+		uint32_t bufsize = sizeof(buff);
 		if (_NSGetExecutablePath(buff, &bufsize) == 0) {
-			len = bufsize;
 			// Resolve symlinks to get the real path
 			char resolved[PATH_MAX];
 			if (realpath(buff, resolved) != NULL) {
 				strncpy(buff, resolved, sizeof(buff) - 1);
-				len = strlen(buff);
+				buff[sizeof(buff) - 1] = '\0';
 			}
+			len = strlen(buff);
 		}
 #elif defined(__FreeBSD__)
 		len = readlink("/proc/curproc/file", buff, sizeof(buff)-1);