diff --git a/src/cmd/CMakeLists.txt b/src/cmd/CMakeLists.txt
index f0fd95de..c940669a 100644
--- a/src/cmd/CMakeLists.txt
+++ b/src/cmd/CMakeLists.txt
@@ -42,6 +42,13 @@ foreach(test ${test_list})
 endforeach()
 
 if (TARGET UNIT_ign_TEST)
+  set_tests_properties(
+    UNIT_ign_TEST
+    PROPERTIES
+    ENVIRONMENT
+      "IGN_CONFIG_PATH=${CMAKE_BINARY_DIR}/test/conf/$<CONFIG>"
+  )
+
   # Running `ign launch` on macOS has problems when run with /usr/bin/ruby
   # due to System Integrity Protection (SIP). Try to find ruby from
   # homebrew as a workaround.
@@ -49,9 +56,6 @@ if (TARGET UNIT_ign_TEST)
     find_program(BREW_RUBY ruby HINTS /usr/local/opt/ruby/bin)
   endif()
 
-  target_compile_definitions(UNIT_ign_TEST PRIVATE
-      "IGN_CONFIG_PATH=\"${CMAKE_BINARY_DIR}/test/conf\"")
-
   target_compile_definitions(UNIT_ign_TEST PRIVATE
       "BREW_RUBY=\"${BREW_RUBY} \"")