diff --git a/flag_float64_slice.go b/flag_float64_slice.go
index 5f6ae72..706ee6c 100644
--- a/flag_float64_slice.go
+++ b/flag_float64_slice.go
@@ -155,11 +155,9 @@ func (c *Context) Float64Slice(name string) []float64 {
 func lookupFloat64Slice(name string, set *flag.FlagSet) []float64 {
 	f := set.Lookup(name)
 	if f != nil {
-		parsed, err := (f.Value.(*Float64Slice)).Value(), error(nil)
-		if err != nil {
-			return nil
+		if slice, ok := f.Value.(*Float64Slice); ok {
+			return slice.Value()
 		}
-		return parsed
 	}
 	return nil
 }
diff --git a/flag_int64_slice.go b/flag_int64_slice.go
index edc3908..6c7fd93 100644
--- a/flag_int64_slice.go
+++ b/flag_int64_slice.go
@@ -151,11 +151,9 @@ func (c *Context) Int64Slice(name string) []int64 {
 func lookupInt64Slice(name string, set *flag.FlagSet) []int64 {
 	f := set.Lookup(name)
 	if f != nil {
-		parsed, err := (f.Value.(*Int64Slice)).Value(), error(nil)
-		if err != nil {
-			return nil
+		if slice, ok := f.Value.(*Int64Slice); ok {
+			return slice.Value()
 		}
-		return parsed
 	}
 	return nil
 }
diff --git a/flag_int_slice.go b/flag_int_slice.go
index 94479f6..4e0afc0 100644
--- a/flag_int_slice.go
+++ b/flag_int_slice.go
@@ -165,11 +165,9 @@ func (c *Context) IntSlice(name string) []int {
 func lookupIntSlice(name string, set *flag.FlagSet) []int {
 	f := set.Lookup(name)
 	if f != nil {
-		parsed, err := (f.Value.(*IntSlice)).Value(), error(nil)
-		if err != nil {
-			return nil
+		if slice, ok := f.Value.(*IntSlice); ok {
+			return slice.Value()
 		}
-		return parsed
 	}
 	return nil
 }
diff --git a/flag_string_slice.go b/flag_string_slice.go
index 71bfef2..b24664b 100644
--- a/flag_string_slice.go
+++ b/flag_string_slice.go
@@ -149,11 +149,9 @@ func (c *Context) StringSlice(name string) []string {
 func lookupStringSlice(name string, set *flag.FlagSet) []string {
 	f := set.Lookup(name)
 	if f != nil {
-		parsed, err := (f.Value.(*StringSlice)).Value(), error(nil)
-		if err != nil {
-			return nil
+		if slice, ok := f.Value.(*StringSlice); ok {
+			return slice.Value()
 		}
-		return parsed
 	}
 	return nil
 }