diff --git a/.github/workflows/ubsan.yml b/.github/workflows/ubsan.yml
index cdc68ec32..d4bb2eda4 100644
--- a/.github/workflows/ubsan.yml
+++ b/.github/workflows/ubsan.yml
@@ -22,7 +22,29 @@ on:
          - '**/COPYING'
          - '**/INSTALL'
          - '**/README*'
-         - '.github/workflows/linux.yml'
+         - '.github/workflows/ubsan.yml'
+         - '!appveyor.yml'
+         - '!.travis.yml'
+
+    pull_request:
+      paths:
+         - '!docs/**'
+         - '!**.md'
+         - '!**.[1-9]'
+         - '**.[chly]'
+         - '**.hin'
+         - '**.in'
+         - '**.am'
+         - '**.m4'
+         - '**.ac'
+         - '**.pl'
+         - '**.py'
+         - '**.asn1'
+         - '**.opt'
+         - '**/COPYING'
+         - '**/INSTALL'
+         - '**/README*'
+         - '.github/workflows/ubsan.yml'
          - '!appveyor.yml'
          - '!.travis.yml'