diff --git a/core/index.go b/core/index.go
index ac5cec1..2acc749 100644
--- a/core/index.go
+++ b/core/index.go
@@ -335,7 +335,7 @@ func (in Index) FindMod(modName string) (string, bool) {
 	for _, v := range in.Files {
 		if v.MetaFile {
 			_, file := filepath.Split(v.File)
-			fileTrimmed := strings.TrimSuffix(file, MetaExtension)
+			fileTrimmed := strings.TrimSuffix(strings.TrimSuffix(file, MetaExtension), MetaExtensionOld)
 			if fileTrimmed == modName {
 				return filepath.Join(filepath.Dir(in.indexFile), filepath.FromSlash(v.File)), true
 			}
diff --git a/core/resolve.go b/core/resolve.go
index 19494f5..6593f1c 100644
--- a/core/resolve.go
+++ b/core/resolve.go
@@ -3,3 +3,5 @@ package core
 // MetaExtension is the file extension of the mod metadata files
 // Note that this is currently not required; it will only be used for new files.
 const MetaExtension = ".pw.toml"
+
+const MetaExtensionOld = ".toml"