diff --git a/apps/openssl/compat/clock_gettime_osx.c b/apps/openssl/compat/clock_gettime_osx.c
index bb385e4..5545187 100644
--- a/apps/openssl/compat/clock_gettime_osx.c
+++ b/apps/openssl/compat/clock_gettime_osx.c
@@ -5,7 +5,7 @@
 #define ORWL_GIGA UINT64_C(1000000000)
 
 int
-clock_gettime(int clock_id, struct timespec *tp)
+clock_gettime(clockid_t clock_id, struct timespec *tp)
 {
 	static double orwl_timebase = 0.0;
 	static uint64_t orwl_timestart = 0;
diff --git a/include/compat/time.h b/include/compat/time.h
index fb0ab29..8f08c9a 100644
--- a/include/compat/time.h
+++ b/include/compat/time.h
@@ -3,6 +3,9 @@
  * sys/time.h compatibility shim
  */
 
+#ifndef LIBCRYPTOCOMPAT_TIME_H
+#define LIBCRYPTOCOMPAT_TIME_H
+
 #ifdef _MSC_VER
 #if _MSC_VER >= 1900
 #include <../ucrt/time.h>
@@ -31,7 +34,8 @@ time_t timegm(struct tm *tm);
 #endif
 
 #ifndef HAVE_CLOCK_GETTIME
-int clock_gettime(int clock_id, struct timespec *tp);
+typedef int clockid_t;
+int clock_gettime(clockid_t clock_id, struct timespec *tp);
 #endif
 
 #ifndef timespecsub
@@ -45,3 +49,5 @@ int clock_gettime(int clock_id, struct timespec *tp);
                 }                                                       \
         } while (0)
 #endif
+
+#endif