diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index c560b4f2..0e5981fe 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -450,9 +450,11 @@ message(STATUS "OpenSCAD version: ${VERSION}")
 string(REGEX MATCHALL "^[0-9]+|[0-9]+|[0-9]+$" MYLIST "${VERSION}")
 list(GET MYLIST 0 OPENSCAD_YEAR)
 list(GET MYLIST 1 OPENSCAD_MONTH)
+math(EXPR OPENSCAD_MONTH ${OPENSCAD_MONTH}) # get rid of leading zero
 list(LENGTH MYLIST VERSIONLEN)
 if (${VERSIONLEN} EQUAL 3)
   list(GET MYLIST 2 OPENSCAD_DAY)
+  math(EXPR OPENSCAD_DAY ${OPENSCAD_DAY}) # get rid of leading zero
 endif()
 
 add_definitions(-DOPENSCAD_VERSION=${VERSION} -DOPENSCAD_YEAR=${OPENSCAD_YEAR} -DOPENSCAD_MONTH=${OPENSCAD_MONTH})