diff --git a/rpc/datatype_string.go b/rpc/datatype_string.go
index 9affed2..e7293b7 100644
--- a/rpc/datatype_string.go
+++ b/rpc/datatype_string.go
@@ -2,7 +2,7 @@
 
 package rpc
 
-import "fmt"
+import "strconv"
 
 const _DataType_name = "DataTypeNoneDataTypeControlDataTypeMarshaledJSONDataTypeOctets"
 
@@ -11,7 +11,7 @@ var _DataType_index = [...]uint8{0, 12, 27, 48, 62}
 func (i DataType) String() string {
 	i -= 1
 	if i >= DataType(len(_DataType_index)-1) {
-		return fmt.Sprintf("DataType(%d)", i+1)
+		return "DataType(" + strconv.FormatInt(int64(i+1), 10) + ")"
 	}
 	return _DataType_name[_DataType_index[i]:_DataType_index[i+1]]
 }
diff --git a/rpc/frametype_string.go b/rpc/frametype_string.go
index 8fc0c68..9e3ced3 100644
--- a/rpc/frametype_string.go
+++ b/rpc/frametype_string.go
@@ -2,7 +2,7 @@
 
 package rpc
 
-import "fmt"
+import "strconv"
 
 const (
 	_FrameType_name_0 = "FrameTypeHeaderFrameTypeDataFrameTypeTrailer"
@@ -11,7 +11,6 @@ const (
 
 var (
 	_FrameType_index_0 = [...]uint8{0, 15, 28, 44}
-	_FrameType_index_1 = [...]uint8{0, 12}
 )
 
 func (i FrameType) String() string {
@@ -22,6 +21,6 @@ func (i FrameType) String() string {
 	case i == 255:
 		return _FrameType_name_1
 	default:
-		return fmt.Sprintf("FrameType(%d)", i)
+		return "FrameType(" + strconv.FormatInt(int64(i), 10) + ")"
 	}
 }
diff --git a/rpc/status_string.go b/rpc/status_string.go
index 85b9f46..10e801d 100644
--- a/rpc/status_string.go
+++ b/rpc/status_string.go
@@ -2,7 +2,7 @@
 
 package rpc
 
-import "fmt"
+import "strconv"
 
 const _Status_name = "StatusOKStatusRequestErrorStatusServerErrorStatusError"
 
@@ -11,7 +11,7 @@ var _Status_index = [...]uint8{0, 8, 26, 43, 54}
 func (i Status) String() string {
 	i -= 1
 	if i >= Status(len(_Status_index)-1) {
-		return fmt.Sprintf("Status(%d)", i+1)
+		return "Status(" + strconv.FormatInt(int64(i+1), 10) + ")"
 	}
 	return _Status_name[_Status_index[i]:_Status_index[i+1]]
 }
diff --git a/zfs/conflict_string.go b/zfs/conflict_string.go
index cf25248..fa3452c 100644
--- a/zfs/conflict_string.go
+++ b/zfs/conflict_string.go
@@ -2,7 +2,7 @@
 
 package zfs
 
-import "fmt"
+import "strconv"
 
 const _Conflict_name = "ConflictIncrementalConflictAllRightConflictNoCommonAncestorConflictDiverged"
 
@@ -10,7 +10,7 @@ var _Conflict_index = [...]uint8{0, 19, 35, 59, 75}
 
 func (i Conflict) String() string {
 	if i < 0 || i >= Conflict(len(_Conflict_index)-1) {
-		return fmt.Sprintf("Conflict(%d)", i)
+		return "Conflict(" + strconv.FormatInt(int64(i), 10) + ")"
 	}
 	return _Conflict_name[_Conflict_index[i]:_Conflict_index[i+1]]
 }