diff --git a/filter/Library_ipt.mk b/filter/Library_ipt.mk
index bad878a4df47..68e913c3f0ac 100644
--- a/filter/Library_ipt.mk
+++ b/filter/Library_ipt.mk
@@ -23,10 +23,6 @@ $(eval $(call gb_Library_use_external,ipt,boost_headers))
 
 $(eval $(call gb_Library_use_sdk_api,ipt))
 
-$(eval $(call gb_Library_add_defs,ipt,\
-	-DPCT_DLLIMPLEMENTATION \
-))
-
 $(eval $(call gb_Library_use_libraries,ipt,\
 	vcl \
 	tl \