diff --git a/.gitignore b/.gitignore
index fd19029..81a9a69 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,3 @@
 /test/index.html
 /test/**/xspec/
-*.out
+*.apply
diff --git a/Makefile b/Makefile
index 89bf7e9..4df9b82 100644
--- a/Makefile
+++ b/Makefile
@@ -19,7 +19,7 @@
 path_src  := src
 path_test := test
 
-test_in_apply_gen := $(path_test)/transform/apply-gen-test-in.xsl.out
+test_in_apply_gen := $(path_test)/transform/apply-gen-test-in.xsl.apply
 
 .PHONY: check test
 
@@ -27,7 +27,7 @@ test: check
 check: $(test_in_apply_gen)
 	$(path_test)/runner
 
-%.xsl.out: %.xsl
+%.apply: %
 	java -jar "$(SAXON_CP)" \
 	    -xsl:"$(path_src)/transform/apply-gen.xsl" \
 	    "$<" > "$@"
diff --git a/test/transform/apply-gen-test.xsl b/test/transform/apply-gen-test.xsl
index 3e79ed3..0b8fd56 100644
--- a/test/transform/apply-gen-test.xsl
+++ b/test/transform/apply-gen-test.xsl
@@ -37,7 +37,7 @@
 
   <!-- N.B. it is expected tha a build process has already built this
        document before running this test -->
-  <import href="apply-gen-test-in.xsl.out" />
+  <import href="apply-gen-test-in.xsl.apply" />
 
 
   <function name="foo:apply-add-two">