diff --git a/src/Makefile.am b/src/Makefile.am
index 6afb7b9..fcb79e0 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -19,4 +19,9 @@
 CLEANFILES = generated.cpp
 
 generated.cpp:
-	$(AM_V_GEN)$(PYTHON) ${srcdir}/pdmgen.py generate-cpp -d ${srcdir}/example -o ${builddir}
+	$(AM_V_GEN)$(PYTHON) ${top_srcdir}/src/pdmgen.py \
+		-t generated.mako.cpp \
+		-p "${srcdir}" \
+		-d ${srcdir}/example \
+		-o ${builddir}/$@ \
+		generate-cpp