diff --git a/CoreFoundation/NumberDate.subproj/CFDate.c b/CoreFoundation/NumberDate.subproj/CFDate.c
index 51966a13be..d8c52f322b 100644
--- a/CoreFoundation/NumberDate.subproj/CFDate.c
+++ b/CoreFoundation/NumberDate.subproj/CFDate.c
@@ -27,7 +27,7 @@
 #endif
 #endif
 
-#if TARGET_OS_MAC || TARGET_OS_LINUX || TARGET_OS_BSD
+#if TARGET_OS_MAC || TARGET_OS_LINUX || TARGET_OS_BSD || TARGET_OS_WASI
 #include <sys/time.h>
 #endif
 
@@ -115,7 +115,7 @@ CF_EXPORT CFTimeInterval CFGetSystemUptime(void) {
 #if TARGET_OS_MAC
     uint64_t tsr = mach_absolute_time();
     return (CFTimeInterval)((double)tsr * __CF1_TSRRate);
-#elif TARGET_OS_LINUX || TARGET_OS_BSD
+#elif TARGET_OS_LINUX || TARGET_OS_BSD || TARGET_OS_WASI
     struct timespec res;
     if (clock_gettime(CLOCK_MONOTONIC, &res) != 0) {
         HALT;
@@ -177,7 +177,7 @@ CF_PRIVATE void __CFDateInitialize(void) {
     }
     __CFTSRRate = (double)freq.QuadPart;
     __CF1_TSRRate = 1.0 / __CFTSRRate;
-#elif TARGET_OS_LINUX || TARGET_OS_BSD
+#elif TARGET_OS_LINUX || TARGET_OS_BSD || TARGET_OS_WASI
     struct timespec res;
     if (clock_getres(CLOCK_MONOTONIC, &res) != 0) {
         HALT;