diff --git a/NEWS b/NEWS
index ed6f0912e..ac9caacb1 100644
--- a/NEWS
+++ b/NEWS
@@ -1,6 +1,7 @@
 ver 0.19.9 (not yet released)
 * decoder
   - dsdiff, dsf: raise ID3 tag limit to 1 MB
+* fix clock integer overflow on OS X
 * fix build failure with uClibc
 * fix build failure on non-POSIX operating systems
 
diff --git a/src/system/Clock.cxx b/src/system/Clock.cxx
index 9baa0c0ca..c2f5e5087 100644
--- a/src/system/Clock.cxx
+++ b/src/system/Clock.cxx
@@ -40,8 +40,8 @@ MonotonicClockS(void)
 	if (base.denom == 0)
 		(void)mach_timebase_info(&base);
 
-	return (unsigned)((mach_absolute_time() * base.numer / 1000)
-			  / (1000000 * base.denom));
+	return (unsigned)(((double)mach_absolute_time() * base.numer / 1000)
+			  / base.denom / 1000000);
 #elif defined(CLOCK_MONOTONIC)
 	struct timespec ts;
 	clock_gettime(CLOCK_MONOTONIC, &ts);
@@ -62,8 +62,8 @@ MonotonicClockMS(void)
 	if (base.denom == 0)
 		(void)mach_timebase_info(&base);
 
-	return (unsigned)((mach_absolute_time() * base.numer)
-			  / (1000000 * base.denom));
+	return (unsigned)(((double)mach_absolute_time() * base.numer)
+			  / base.denom / 1000000);
 #elif defined(CLOCK_MONOTONIC)
 	struct timespec ts;
 	clock_gettime(CLOCK_MONOTONIC, &ts);
@@ -104,8 +104,8 @@ MonotonicClockUS(void)
 	if (base.denom == 0)
 		(void)mach_timebase_info(&base);
 
-	return ((uint64_t)mach_absolute_time() * (uint64_t)base.numer)
-		/ (1000 * (uint64_t)base.denom);
+	return (uint64_t)(((double)mach_absolute_time() * base.numer)
+		/ base.denom / 1000);
 #elif defined(CLOCK_MONOTONIC)
 	struct timespec ts;
 	clock_gettime(CLOCK_MONOTONIC, &ts);