diff --git a/compat/clock_gettime/clock_gettime.h b/compat/clock_gettime/clock_gettime.h
index 83fdac7..3c4c29b 100644
--- a/compat/clock_gettime/clock_gettime.h
+++ b/compat/clock_gettime/clock_gettime.h
@@ -3,9 +3,17 @@
 
 #include <mach/mach_time.h> // Apple-only, but this isn't inclued on other BSDs
 
+#ifdef __OpenBSD__
 #ifdef _CLOCKID_T_DEFINED_
 #define CLOCKID_T
 #endif
+#endif
+
+#ifdef __APPLE__
+#ifdef CLOCK_MONOTONIC
+#define CLOCKID_T
+#endif
+#endif
 
 #ifndef CLOCKID_T
 #define CLOCKID_T
diff --git a/compat/clock_nanosleep/clock_nanosleep.h b/compat/clock_nanosleep/clock_nanosleep.h
index 9a8da5d..34eb801 100644
--- a/compat/clock_nanosleep/clock_nanosleep.h
+++ b/compat/clock_nanosleep/clock_nanosleep.h
@@ -1,9 +1,17 @@
 #ifndef CLOCK_NANOSLEEP_H
 #define CLOCK_NANOSLEEP_H
 
+#ifdef __OpenBSD__
 #ifdef _CLOCKID_T_DEFINED_
 #define CLOCKID_T
 #endif
+#endif
+
+#ifdef __APPLE__
+#ifdef CLOCK_MONOTONIC
+#define CLOCKID_T
+#endif
+#endif
 
 #ifndef CLOCKID_T
 #define CLOCKID_T