diff --git a/.github/workflows/c.yml b/.github/workflows/c.yml
index 1d00337..fca13ef 100644
--- a/.github/workflows/c.yml
+++ b/.github/workflows/c.yml
@@ -1,6 +1,6 @@
 name: C CI
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   ubuntu16:
diff --git a/.github/workflows/java.yml b/.github/workflows/java.yml
index fd060d1..bb3952f 100644
--- a/.github/workflows/java.yml
+++ b/.github/workflows/java.yml
@@ -1,6 +1,6 @@
 name: Java CI
 
-on: [push]
+on: [push, pull_request]
 
 jobs:
   build: