diff --git a/services/std_svc/spm/spm_buffers.c b/services/std_svc/spm/spm_buffers.c
index 3e0c949..79398ba 100644
--- a/services/std_svc/spm/spm_buffers.c
+++ b/services/std_svc/spm/spm_buffers.c
@@ -38,6 +38,8 @@
 		struct sprt_response *resp = &(responses[i]);
 
 		if ((resp->is_valid == 1) && (resp->token == token)) {
+			spin_unlock(&responses_lock);
+
 			return -1;
 		}
 	}