diff --git a/patch_emscripten.py b/patch_emscripten.py
index bce6720..56f3cef 100755
--- a/patch_emscripten.py
+++ b/patch_emscripten.py
@@ -28,8 +28,14 @@ def main(raw_args):
     ]
 
     from subprocess import Popen
+    from sys import exit
     for patch in patches:
-        proc = Popen('bash -c \'patch -N -p1 < %s; exit 0\'' % patch, cwd=emsdk_root, shell=True)
+        patch_cmd = 'patch -N -p1 < %s' % patch
+        print('Running: %s' % patch_cmd)
+        proc = Popen('bash -c \'%s; exit $?\'' % patch_cmd, cwd=emsdk_root, shell=True)
+        exit_code = proc.wait()
+        if exit_code != 0:
+            exit('patch exited with error code: %s' % exit_code)
 
 
 if __name__ == '__main__':
diff --git a/patch_mono.py b/patch_mono.py
index 6c42672..c58bb14 100755
--- a/patch_mono.py
+++ b/patch_mono.py
@@ -33,8 +33,14 @@ def main(raw_args):
     ]
 
     from subprocess import Popen
+    from sys import exit
     for patch in patches:
-        proc = Popen('bash -c \'patch -N -p1 < %s; exit 0\'' % os.path.join(patches_dir, patch), cwd=mono_source_root, shell=True)
+        patch_cmd = 'patch -N -p1 < %s' % os.path.join(patches_dir, patch)
+        print('Running: %s' % patch_cmd)
+        proc = Popen('bash -c \'%s; exit $?\'' % patch_cmd, cwd=mono_source_root, shell=True)
+        exit_code = proc.wait()
+        if exit_code != 0:
+            exit('patch exited with error code: %s' % exit_code)
 
 
 if __name__ == '__main__':