env.removePackage: fix removing single package

1 files changed, 1 insertions, 1 deletions

diff --git a/env.go b/env.go
index 82ae075..b9d492e 100644
--- a/env.go
+++ b/env.go
@@ -535,7 +535,7 @@ func (env *Env) removePackage(importPath string) (err error) {
 		}
 	}
 
-	if idx == 0 {
+	if idx < 0 {
 		return
 	}