diff --git a/cmake/genpy-extras.cmake.em b/cmake/genpy-extras.cmake.em
index fd78a97..5a57285 100644
--- a/cmake/genpy-extras.cmake.em
+++ b/cmake/genpy-extras.cmake.em
@@ -1,9 +1,9 @@
 @[if DEVELSPACE]@
-# bin dir variables in develspace
+# location of scripts in develspace
 set(GENPY_BIN_DIR "@(CMAKE_CURRENT_SOURCE_DIR)/scripts")
 @[else]@
-# bin dir variables in installspace
-set(GENPY_BIN_DIR "@(CMAKE_INSTALL_PREFIX)/@(CATKIN_PACKAGE_BIN_DESTINATION)")
+# location of scripts in installspace
+set(GENPY_BIN_DIR "${genpy_DIR}/../../../@(CATKIN_PACKAGE_BIN_DESTINATION)")
 @[end if]@
 
 set(GENMSG_PY_BIN ${GENPY_BIN_DIR}/genmsg_py.py)