diff --git a/ci/build.sh b/ci/build.sh
index 8e34e4d..f8be9e2 100755
--- a/ci/build.sh
+++ b/ci/build.sh
@@ -1,10 +1,13 @@
 #!/bin/bash
 
-# Check for changes in builds/ folder
-builds_changes=$(git diff --name-only master | grep -E '^builds/')
-
-# Check for changes in images/ folder
-images_changes=$(git diff --name-only master | grep -E '^images/')
+# Check for changes in images/ folder and the builds/ folder
+if [ "$(git branch --show-current)" = "master" ]; then
+  builds_changes=$(git diff --name-only HEAD^...master | grep -E '^builds/')
+  images_changes=$(git diff --name-only HEAD^...master | grep -E '^images/')
+else
+  builds_changes=$(git diff --name-only master | grep -E '^builds/')
+  images_changes=$(git diff --name-only master | grep -E '^images/')
+fi
 
 # Run `make all` if there are changes in builds/
 if [ -n "$builds_changes" ]; then