diff --git a/module/CMakeLists.txt b/module/CMakeLists.txt
index 5e507a9e..4dfc477c 100644
--- a/module/CMakeLists.txt
+++ b/module/CMakeLists.txt
@@ -1,6 +1,6 @@
 # just use the pgxs makefile
 ADD_CUSTOM_COMMAND( OUTPUT ${CMAKE_CURRENT_SOURCE_DIR}/dummy
-        COMMAND PGXS=${PGXS} PG_CONFIG=${PG_CONFIG} make -f ${CMAKE_CURRENT_SOURCE_DIR}/Makefile
+        COMMAND PGXS=${PGXS} PG_CONFIG=${PG_CONFIG} MODSRCDIR=${CMAKE_CURRENT_SOURCE_DIR} make -f ${CMAKE_CURRENT_SOURCE_DIR}/Makefile
         COMMENT "Running external makefile ${PGXS}"
         )
 
diff --git a/module/Makefile b/module/Makefile
index 783a6602..78b395a5 100644
--- a/module/Makefile
+++ b/module/Makefile
@@ -1,4 +1,5 @@
 MODULES = nominatim
+VPATH = $(MODSRCDIR)
 include $(PGXS)
 
 all: