diff --git a/compat.h b/compat.h
index 1da332e..c0f4716 100644
--- a/compat.h
+++ b/compat.h
@@ -30,11 +30,13 @@
 #include <unistd.h>
 
 /* Define gettid for older glibc versions (below 2.30) */
-#if defined(__GLIBC__) && !__GLIBC_PREREQ(2, 30)
+#if defined(__GLIBC__)
+#if !__GLIBC_PREREQ(2, 30)
 static inline pid_t gettid(void)
 {
 	return (pid_t)syscall(SYS_gettid);
 }
-#endif
+#endif /* !__GLIBC_PREREQ(2, 30) */
+#endif /* defined(__GLIBC__) */
 
 #endif // COMPAT_H