diff --git a/test/Makefile.am b/test/Makefile.am
index 305f62dc5..490e42e96 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -591,12 +591,19 @@ REFERENCE_IMAGES = \
 	skew-extreme-ref.png \
 	skew-extreme-ps-ref.png \
 	smask-ref.png			\
+	smask-pdf-ref.png		\
 	smask-fill-ref.png		\
+	smask-fill-pdf-ref.png		\
 	smask-image-mask-ref.png	\
+	smask-image-mask-pdf-ref.png	\
 	smask-mask-ref.png		\
+	smask-mask-pdf-ref.png		\
 	smask-paint-ref.png		\
+	smask-paint-pdf-ref.png		\
 	smask-stroke-ref.png		\
+	smask-stroke-pdf-ref.png	\
 	smask-text-ref.png		\
+	smask-text-pdf-ref.png		\
 	stroke-image-ref.png \
 	stroke-image-pdf-ref.png \
 	stroke-image-ps-ref.png \
diff --git a/test/smask-fill-pdf-ref.png b/test/smask-fill-pdf-ref.png
new file mode 100644
index 000000000..dc87a5f0d
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diff --git a/test/smask-image-mask-pdf-ref.png b/test/smask-image-mask-pdf-ref.png
new file mode 100644
index 000000000..54baefda0
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diff --git a/test/smask-mask-pdf-ref.png b/test/smask-mask-pdf-ref.png
new file mode 100644
index 000000000..94dac1dc8
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diff --git a/test/smask-paint-pdf-ref.png b/test/smask-paint-pdf-ref.png
new file mode 100644
index 000000000..7d82db9a5
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diff --git a/test/smask-pdf-ref.png b/test/smask-pdf-ref.png
new file mode 100644
index 000000000..7d82db9a5
Binary files /dev/null and b/test/smask-pdf-ref.png differ
diff --git a/test/smask-stroke-pdf-ref.png b/test/smask-stroke-pdf-ref.png
new file mode 100644
index 000000000..ac9b5a18b
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diff --git a/test/smask-text-pdf-ref.png b/test/smask-text-pdf-ref.png
new file mode 100644
index 000000000..7542d3dd4
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