diff --git a/tests/include.ctest.sh.in b/tests/include.ctest.sh.in
index a2ef06613..811efed0c 100644
--- a/tests/include.ctest.sh.in
+++ b/tests/include.ctest.sh.in
@@ -11,7 +11,8 @@ proj_dir=@PROJECT_SOURCE_DIR@
 data_dir=@PROJECT_BINARY_DIR@/data
 
 # use definitions from binary dir to test if installation will be correct
-def_dir="@CMAKE_BINARY_DIR@/share/@PROJECT_NAME@/definitions"
+# Note: 'definitions' is a symlink so must put final slash to interpret as directory
+def_dir="@CMAKE_BINARY_DIR@/share/@PROJECT_NAME@/definitions/"
 ECCODES_DEFINITION_PATH="${def_dir}"
 export ECCODES_DEFINITION_PATH