diff --git a/lib/ceedling/test_invoker.rb b/lib/ceedling/test_invoker.rb
index 87c4661e..4447cb1f 100644
--- a/lib/ceedling/test_invoker.rb
+++ b/lib/ceedling/test_invoker.rb
@@ -362,7 +362,7 @@ def compile_test_component(tool:TOOLS_TEST_COMPILER, context:TEST_SYM, test:, so
     testable = @testables[test]
     filepath = testable[:filepath]
     flags = testable[:compile_flags]
-    defines = testable[:defines]
+    defines = testable[:compile_defines]
 
     # Tailor search path--remove duplicates and reduce list to only those needed by vendor / support file compilation
     search_paths = @helper.tailor_search_paths(search_paths:testable[:search_paths], filepath:source)