diff --git a/run/CMakeLists.txt b/run/CMakeLists.txt
index 4822e95..18b28aa 100644
--- a/run/CMakeLists.txt
+++ b/run/CMakeLists.txt
@@ -17,6 +17,7 @@ include_directories(include)
 
 source_group("CLI" FILES ${EPANET_CLI_SOURCES})
 
+add_definitions(-DWITH_GENX)
 
 # Creates the EPANET command line executable
 add_executable(runepanet ${EPANET_CLI_SOURCES})