--- a/apps/plugins/plugins.make
+++ b/apps/plugins/plugins.make
@@ -8,7 +8,14 @@
 #

 # single-file plugins:
+is_app_build =
 ifdef APP_TYPE
+ifneq ($(APP_TYPE),sdl-sim)
+  is_app_build = yes
+endif
+endif
+
+ifdef is_app_build
 PLUGINS_SRC = $(call preprocess, $(APPSDIR)/plugins/SOURCES.app_build)
 else
 PLUGINS_SRC = $(call preprocess, $(APPSDIR)/plugins/SOURCES)
@@ -40,7 +47,7 @@ endif
 OTHER_SRC += $(ROOTDIR)/apps/plugins/plugin_crt0.c
 PLUGIN_CRT0 := $(BUILDDIR)/apps/plugins/plugin_crt0.o
 # multifile plugins (subdirs):
-ifdef APP_TYPE
+ifdef is_app_build
 PLUGINSUBDIRS := $(call preprocess, $(APPSDIR)/plugins/SUBDIRS.app_build)
 else
 PLUGINSUBDIRS := $(call preprocess, $(APPSDIR)/plugins/SUBDIRS)