diff --git a/crypto/ec/ec2_smpl.c b/crypto/ec/ec2_smpl.c
index 1132c8e5afa828333202066c3d0309a583504b0e..d34e97d676d859f64675c25c4c31080d2b13b6ca 100644
--- a/crypto/ec/ec2_smpl.c
+++ b/crypto/ec/ec2_smpl.c
@@ -575,7 +575,7 @@ int ec_GF2m_simple_oct2point(const EC_GROUP *group, EC_POINT *point,
 		}
 	form = buf[0];
 	y_bit = form & 1;
-	form = form & ~1;
+	form = form & ~1U;
 	if ((form != 0)	&& (form != POINT_CONVERSION_COMPRESSED)
 		&& (form != POINT_CONVERSION_UNCOMPRESSED)
 		&& (form != POINT_CONVERSION_HYBRID))
diff --git a/crypto/ec/ecp_smpl.c b/crypto/ec/ecp_smpl.c
index de90f90aa10defb62c9f69cc5a889d3421fa2048..9937719520e74cceaa429562d0ce3de157c1a869 100644
--- a/crypto/ec/ecp_smpl.c
+++ b/crypto/ec/ecp_smpl.c
@@ -902,7 +902,7 @@ int ec_GFp_simple_oct2point(const EC_GROUP *group, EC_POINT *point,
 		}
 	form = buf[0];
 	y_bit = form & 1;
-	form = form & ~1;
+	form = form & ~1U;
 	if ((form != 0)	&& (form != POINT_CONVERSION_COMPRESSED)
 		&& (form != POINT_CONVERSION_UNCOMPRESSED)
 		&& (form != POINT_CONVERSION_HYBRID))