diff --git a/cmake/GtsamMakeConfigFile.cmake b/cmake/GtsamMakeConfigFile.cmake
index 0479a2524..91cb98a8c 100644
--- a/cmake/GtsamMakeConfigFile.cmake
+++ b/cmake/GtsamMakeConfigFile.cmake
@@ -27,6 +27,8 @@ function(GtsamMakeConfigFile PACKAGE_NAME)
 	# here.
 	if(NOT DEFINED ${PACKAGE_NAME}_VERSION AND DEFINED ${PACKAGE_NAME}_VERSION_STRING)
 		set(${PACKAGE_NAME}_VERSION ${${PACKAGE_NAME}_VERSION_STRING})
+	elseif(NOT DEFINED ${PACKAGE_NAME}_VERSION_STRING)
+		set(${PACKAGE_NAME}_VERSION ${GTSAM_VERSION_STRING})
 	endif()
 
 	# Version file