diff --git a/extra.mk.in b/extra.mk.in
index 0f6ab5d..f3a14c0 100644
--- a/extra.mk.in
+++ b/extra.mk.in
@@ -6,5 +6,6 @@ EXCEPTIONS_A = @EXCEPTIONS_A@
 EXCEPTIONS_EXCEPTIONS_A = @EXCEPTIONS_EXCEPTIONS_A@
 EXCEPTIONS_EXCEPTIONS_LIB_A = @EXCEPTIONS_EXCEPTIONS_LIB_A@
 EXCEPTIONS_LIB_A = @EXCEPTIONS_LIB_A@
+OBJFW_CONFIG = @OBJFW_CONFIG@
 OBJFW_FRAMEWORK_LIBS = @OBJFW_FRAMEWORK_LIBS@
 OBJFW_LIBS = @OBJFW_LIBS@