diff --git a/src/mono/mono/utils/mono-os-mutex.h b/src/mono/mono/utils/mono-os-mutex.h
index 30f914b0893a29..20055973f81cf8 100644
--- a/src/mono/mono/utils/mono-os-mutex.h
+++ b/src/mono/mono/utils/mono-os-mutex.h
@@ -36,7 +36,7 @@
 
 #if !defined(HOST_WIN32)
 
-#if !defined(CLOCK_MONOTONIC) || defined(HOST_DARWIN) || defined(HOST_WASM)
+#if !defined(CLOCK_MONOTONIC) || defined(HOST_DARWIN) || defined(HOST_WASI)
 #define BROKEN_CLOCK_SOURCE
 #endif
 
diff --git a/src/mono/mono/utils/mono-time.c b/src/mono/mono/utils/mono-time.c
index 68831393bc7c34..2a89bd9d3d0772 100644
--- a/src/mono/mono/utils/mono-time.c
+++ b/src/mono/mono/utils/mono-time.c
@@ -119,9 +119,10 @@ gint64
 mono_msec_boottime (void)
 {
 	/* clock_gettime () is found by configure on Apple builds, but its only present from ios 10, macos 10.12, tvos 10 and watchos 3 */
-#if !defined (TARGET_WASM) && ((defined(HAVE_CLOCK_MONOTONIC_COARSE) || defined(HAVE_CLOCK_MONOTONIC)) && !(defined(TARGET_IOS) || defined(TARGET_OSX) || defined(TARGET_WATCHOS) || defined(TARGET_TVOS)))
+#if ((defined(HAVE_CLOCK_MONOTONIC_COARSE) || defined(HAVE_CLOCK_MONOTONIC)) && !(defined(TARGET_IOS) || defined(TARGET_OSX) || defined(TARGET_WATCHOS) || defined(TARGET_TVOS)))
 	clockid_t clockType =
-#if HAVE_CLOCK_MONOTONIC_COARSE
+	/* emscripten exposes CLOCK_MONOTONIC_COARSE but doesn't implement it */
+#if defined(HAVE_CLOCK_MONOTONIC_COARSE) && !defined(TARGET_WASM)
 	CLOCK_MONOTONIC_COARSE; /* good enough resolution, fastest speed */
 #else
 	CLOCK_MONOTONIC;