diff --git a/hook/hook.go b/hook/hook.go
index 9699f39..4b59ce9 100644
--- a/hook/hook.go
+++ b/hook/hook.go
@@ -367,7 +367,7 @@ func (h *Hook) ExtractCommandArgumentsForEnv(headers, query, payload *map[string
 		if arg, ok := h.PassEnvironmentToCommand[i].Get(headers, query, payload); ok {
 			if h.PassEnvironmentToCommand[i].EnvName != "" {
 				// first try to use the EnvName if specified
-				args = append(args, EnvNamespace+h.PassEnvironmentToCommand[i].EnvName+"="+arg)
+				args = append(args, h.PassEnvironmentToCommand[i].EnvName+"="+arg)
 			} else {
 				// then fallback on the name
 				args = append(args, EnvNamespace+h.PassEnvironmentToCommand[i].Name+"="+arg)
diff --git a/hook/hook_test.go b/hook/hook_test.go
index f9ae1f7..1fc9a88 100644
--- a/hook/hook_test.go
+++ b/hook/hook_test.go
@@ -179,7 +179,7 @@ var hookExtractCommandArgumentsForEnvTests = []struct {
 		"test",
 		[]Argument{Argument{"header", "a", "MYKEY"}},
 		&map[string]interface{}{"a": "z"}, nil, nil,
-		[]string{"HOOK_MYKEY=z"},
+		[]string{"MYKEY=z"},
 		true,
 	},
 	// failures