diff --git a/rbd/rbd.go b/rbd/rbd.go
index cd83e79..4e34326 100644
--- a/rbd/rbd.go
+++ b/rbd/rbd.go
@@ -24,29 +24,29 @@ import (
 
 const (
 	// RBD features.
-	RbdFeatureLayering      = C.RBD_FEATURE_LAYERING
-	RbdFeatureStripingV2    = C.RBD_FEATURE_STRIPINGV2
-	RbdFeatureExclusiveLock = C.RBD_FEATURE_EXCLUSIVE_LOCK
-	RbdFeatureObjectMap     = C.RBD_FEATURE_OBJECT_MAP
-	RbdFeatureFastDiff      = C.RBD_FEATURE_FAST_DIFF
-	RbdFeatureDeepFlatten   = C.RBD_FEATURE_DEEP_FLATTEN
-	RbdFeatureJournaling    = C.RBD_FEATURE_JOURNALING
-	RbdFeatureDataPool      = C.RBD_FEATURE_DATA_POOL
+	RbdFeatureLayering      = uint64(C.RBD_FEATURE_LAYERING)
+	RbdFeatureStripingV2    = uint64(C.RBD_FEATURE_STRIPINGV2)
+	RbdFeatureExclusiveLock = uint64(C.RBD_FEATURE_EXCLUSIVE_LOCK)
+	RbdFeatureObjectMap     = uint64(C.RBD_FEATURE_OBJECT_MAP)
+	RbdFeatureFastDiff      = uint64(C.RBD_FEATURE_FAST_DIFF)
+	RbdFeatureDeepFlatten   = uint64(C.RBD_FEATURE_DEEP_FLATTEN)
+	RbdFeatureJournaling    = uint64(C.RBD_FEATURE_JOURNALING)
+	RbdFeatureDataPool      = uint64(C.RBD_FEATURE_DATA_POOL)
 
-	RbdFeaturesDefault = C.RBD_FEATURES_DEFAULT
+	RbdFeaturesDefault = uint64(C.RBD_FEATURES_DEFAULT)
 
 	// Features that make an image inaccessible for read or write by clients that don't understand
 	// them.
-	RbdFeaturesIncompatible = C.RBD_FEATURES_INCOMPATIBLE
+	RbdFeaturesIncompatible = uint64(C.RBD_FEATURES_INCOMPATIBLE)
 
 	// Features that make an image unwritable by clients that don't understand them.
-	RbdFeaturesRwIncompatible = C.RBD_FEATURES_RW_INCOMPATIBLE
+	RbdFeaturesRwIncompatible = uint64(C.RBD_FEATURES_RW_INCOMPATIBLE)
 
 	// Features that may be dynamically enabled or disabled.
-	RbdFeaturesMutable = C.RBD_FEATURES_MUTABLE
+	RbdFeaturesMutable = uint64(C.RBD_FEATURES_MUTABLE)
 
 	// Features that only work when used with a single client using the image for writes.
-	RbdFeaturesSingleClient = C.RBD_FEATURES_SINGLE_CLIENT
+	RbdFeaturesSingleClient = uint64(C.RBD_FEATURES_SINGLE_CLIENT)
 )
 
 // bits for Image.validate() and Snapshot.validate()