diff --git a/internal/terraform/rootmodule/root_module.go b/internal/terraform/rootmodule/root_module.go
index 7a8f004de..9937f4474 100644
--- a/internal/terraform/rootmodule/root_module.go
+++ b/internal/terraform/rootmodule/root_module.go
@@ -303,23 +303,23 @@ func (rm *rootModule) PathsToWatch() []string {
 }
 
 func (rm *rootModule) IsKnownModuleManifestFile(path string) bool {
-	rm.pluginMu.RLock()
-	defer rm.pluginMu.RUnlock()
+	rm.moduleMu.RLock()
+	defer rm.moduleMu.RUnlock()
 
-	if rm.pluginLockFile == nil {
+	if rm.moduleManifestFile == nil {
 		return false
 	}
 
-	return rm.pluginLockFile.Path() == path
+	return rm.moduleManifestFile.Path() == path
 }
 
 func (rm *rootModule) IsKnownPluginLockFile(path string) bool {
-	rm.moduleMu.RLock()
-	defer rm.moduleMu.RUnlock()
+	rm.pluginMu.RLock()
+	defer rm.pluginMu.RUnlock()
 
-	if rm.moduleManifestFile == nil {
+	if rm.pluginLockFile == nil {
 		return false
 	}
 
-	return rm.moduleManifestFile.Path() == path
+	return rm.pluginLockFile.Path() == path
 }