diff --git a/cmake/speed-dreams-data.cmake.in b/cmake/speed-dreams-data.cmake.in
index bafa8e4d..9001b260 100644
--- a/cmake/speed-dreams-data.cmake.in
+++ b/cmake/speed-dreams-data.cmake.in
@@ -1,4 +1,5 @@
 @PACKAGE_INIT@
 set_and_check(SD_DATADIR_ABS "@PACKAGE_datadir@")
+set(SD_DATADIR_INSTALL_PREFIX "${SD_DATADIR_ABS}")
 set(SD_DATADIR "@datadir@")
 check_required_components(speed-dreams-data)