diff --git a/Makefile b/Makefile
index 19e4d48..f7008e8 100644
--- a/Makefile
+++ b/Makefile
@@ -48,8 +48,10 @@ dist:
 		$(PACKAGE)-$(VERSION)/src/project.conf \
 		$(PACKAGE)-$(VERSION)/tests/define.cpp \
 		$(PACKAGE)-$(VERSION)/tests/if.cpp \
+		$(PACKAGE)-$(VERSION)/tests/include.cpp \
 		$(PACKAGE)-$(VERSION)/tests/Makefile \
 		$(PACKAGE)-$(VERSION)/tests/cpp.sh \
+		$(PACKAGE)-$(VERSION)/tests/include-define.cpp \
 		$(PACKAGE)-$(VERSION)/tests/project.conf \
 		$(PACKAGE)-$(VERSION)/Makefile \
 		$(PACKAGE)-$(VERSION)/COPYING \
diff --git a/tests/Makefile b/tests/Makefile
index 100ea7e..8ee2d8c 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,4 +1,4 @@
-TARGETS	= define.o if.o
+TARGETS	= define.o if.o include.o
 PREFIX	= /usr/local
 DESTDIR	=
 BINDIR	= $(PREFIX)/bin
@@ -19,14 +19,20 @@ define.o_CXXFLAGS = $(CPPFLAGSF) $(CPPFLAGS) $(CXXFLAGS)
 if.o_OBJS = if.o
 if.o_CXXFLAGS = $(CPPFLAGSF) $(CPPFLAGS) $(CXXFLAGS)
 
+include.o_OBJS = include.o
+include.o_CXXFLAGS = $(CPPFLAGSF) $(CPPFLAGS) $(CXXFLAGS)
+
 define.o: define.cpp cpp.sh
 	$(CXX) $(define.o_CXXFLAGS) -c define.cpp
 
 if.o: if.cpp cpp.sh
 	$(CXX) $(if.o_CXXFLAGS) -c if.cpp
 
+include.o: include.cpp cpp.sh
+	$(CXX) $(include.o_CXXFLAGS) -c include.cpp
+
 clean:
-	$(RM) -- $(define.o_OBJS) $(if.o_OBJS)
+	$(RM) -- $(define.o_OBJS) $(if.o_OBJS) $(include.o_OBJS)
 
 distclean: clean
 	$(RM) -- $(TARGETS)
diff --git a/tests/include-define.cpp b/tests/include-define.cpp
new file mode 100644
index 0000000..5256ba1
--- /dev/null
+++ b/tests/include-define.cpp
@@ -0,0 +1 @@
+#define GOOD
diff --git a/tests/include.cpp b/tests/include.cpp
new file mode 100644
index 0000000..c60de36
--- /dev/null
+++ b/tests/include.cpp
@@ -0,0 +1,6 @@
+#include "include-define.cpp"
+#ifdef GOOD
+#warning good
+#else
+#error error
+#endif
diff --git a/tests/project.conf b/tests/project.conf
index fdf41bb..3e585ed 100644
--- a/tests/project.conf
+++ b/tests/project.conf
@@ -1,11 +1,12 @@
-targets=define.o,if.o
+targets=define.o,if.o,include.o
 cxx=./cpp.sh
 cxxflags=
-dist=Makefile,cpp.sh
+dist=Makefile,cpp.sh,include-define.cpp
 
 [define.o]
 type=object
 sources=define.cpp
+depends=../src/cpp
 
 [define.cpp]
 depends=cpp.sh
@@ -13,6 +14,15 @@ depends=cpp.sh
 [if.o]
 type=object
 sources=if.cpp
+depends=../src/cpp
 
 [if.cpp]
 depends=cpp.sh
+
+[include.o]
+type=object
+sources=include.cpp
+depends=../src/cpp
+
+[include.cpp]
+depends=cpp.sh