@@ -20,11 +20,10 @@
 #include <stdint.h>
 #include <limits.h>
 #include <time.h>
 #include <math.h>
 #include <float.h>
-#include <assert.h>
 
 #include <sys/time.h>
 
 #import "OFDate.h"
 #import "OFString.h"
@@ -217,11 +216,11 @@
 {
 	struct timeval t;
 
 	self = [super init];
 
-	assert(!gettimeofday(&t, NULL));
+	OF_ENSURE(!gettimeofday(&t, NULL));
 
 	seconds = t.tv_sec;
 	seconds += (double)t.tv_usec / 1000000;
 
 	return self;
@@ -623,11 +622,11 @@
 - (double)timeIntervalSinceNow
 {
 	struct timeval t;
 	double seconds_;
 
-	assert(!gettimeofday(&t, NULL));
+	OF_ENSURE(!gettimeofday(&t, NULL));
 
 	seconds_ = t.tv_sec;
 	seconds_ += (double)t.tv_usec / 1000000;
 
 	return seconds - seconds_;