diff --git a/src/backend/access/tablesample/bernoulli.c b/src/backend/access/tablesample/bernoulli.c
index cf88f95e757b1754da8b4d074c9abfc367560208..ccef4f7f8438828bf6b3de8b6097ca5695335d91 100644
--- a/src/backend/access/tablesample/bernoulli.c
+++ b/src/backend/access/tablesample/bernoulli.c
@@ -144,6 +144,7 @@ bernoulli_beginsamplescan(SampleScanState *node,
 {
 	BernoulliSamplerData *sampler = (BernoulliSamplerData *) node->tsm_state;
 	double		percent = DatumGetFloat4(params[0]);
+	double		dcutoff;
 
 	if (percent < 0 || percent > 100 || isnan(percent))
 		ereport(ERROR,
@@ -155,7 +156,8 @@ bernoulli_beginsamplescan(SampleScanState *node,
 	 * store that as a uint64, of course.  Note that this gives strictly
 	 * correct behavior at the limits of zero or one probability.
 	 */
-	sampler->cutoff = rint(((double) PG_UINT32_MAX + 1) * percent / 100);
+	dcutoff = rint(((double) PG_UINT32_MAX + 1) * percent / 100);
+	sampler->cutoff = (uint64) dcutoff;
 	sampler->seed = seed;
 	sampler->lt = InvalidOffsetNumber;
 
diff --git a/src/backend/access/tablesample/system.c b/src/backend/access/tablesample/system.c
index 43c5dab71619a7a6d8e2ee22bc306e56674191c0..080a3121141e05f7078ce072aa661d72510bba7b 100644
--- a/src/backend/access/tablesample/system.c
+++ b/src/backend/access/tablesample/system.c
@@ -148,6 +148,7 @@ system_beginsamplescan(SampleScanState *node,
 {
 	SystemSamplerData *sampler = (SystemSamplerData *) node->tsm_state;
 	double		percent = DatumGetFloat4(params[0]);
+	double		dcutoff;
 
 	if (percent < 0 || percent > 100 || isnan(percent))
 		ereport(ERROR,
@@ -159,7 +160,8 @@ system_beginsamplescan(SampleScanState *node,
 	 * store that as a uint64, of course.  Note that this gives strictly
 	 * correct behavior at the limits of zero or one probability.
 	 */
-	sampler->cutoff = rint(((double) PG_UINT32_MAX + 1) * percent / 100);
+	dcutoff = rint(((double) PG_UINT32_MAX + 1) * percent / 100);
+	sampler->cutoff = (uint64) dcutoff;
 	sampler->seed = seed;
 	sampler->nextblock = 0;
 	sampler->lt = InvalidOffsetNumber;