diff --git a/internal/literals/literals.go b/internal/literals/literals.go
index 9ed5bdc..8f3b722 100644
--- a/internal/literals/literals.go
+++ b/internal/literals/literals.go
@@ -51,14 +51,8 @@ func Obfuscate(file *ast.File, info *types.Info, fset *token.FileSet, ignoreObj
 				for _, name := range spec.Names {
 					obj := info.ObjectOf(name)
 
-					basic, ok := obj.Type().(*types.Basic)
-					if !ok {
-						// skip the block if it contains non basic types
-						return false
-					}
-
-					if basic.Info()&types.IsUntyped != 0 {
-						// skip the block if it contains untyped constants
+					// We only obfuscate const declarations with typed string values.
+					if obj.Type() != types.Typ[types.String] {
 						return false
 					}
 
diff --git a/testdata/scripts/literals.txt b/testdata/scripts/literals.txt
index fcc3b08..97dc18d 100644
--- a/testdata/scripts/literals.txt
+++ b/testdata/scripts/literals.txt
@@ -88,6 +88,11 @@ const (
 	skip2 = "also skip this"
 )
 
+// We used to conver this to a var in an attempt of obfuscating the literal.
+// That would break the iota, which only works inside const declarations.
+// We only obfuscate constant declarations with string values, anyway.
+const fooTyped uint64 = 1 << iota
+
 const arrayLen = 4
 
 var array [arrayLen]byte