diff --git a/tools/build/tests/ex/Build b/tools/build/tests/ex/Build
index 429c7d4521016283ef81bc1dbd1e9ae93e8f2581..4d502f9b1a50e5c55e8ddd4b745a77acf72f6a87 100644
--- a/tools/build/tests/ex/Build
+++ b/tools/build/tests/ex/Build
@@ -4,6 +4,7 @@ ex-y += b.o
 ex-y += b.o
 ex-y += empty/
 ex-y += empty2/
+ex-y += inc.o
 
 libex-y += c.o
 libex-y += d.o
diff --git a/tools/build/tests/ex/Makefile b/tools/build/tests/ex/Makefile
index a8f596e37fd289ef81b3dd5beb0ec67f6884d647..f279b84cb85943b3ecbb529df83927e3a49a8f40 100644
--- a/tools/build/tests/ex/Makefile
+++ b/tools/build/tests/ex/Makefile
@@ -1,4 +1,4 @@
-export srctree := ../../../..
+export srctree := $(abspath ../../../..)
 export CC      := gcc
 export LD      := ld
 export AR      := ar
diff --git a/tools/build/tests/ex/ex.c b/tools/build/tests/ex/ex.c
index dc42eb2e1a677414b32001de061eb1868acd5827..57de6074d252857fdbaf4c115a25c254b3bd2a94 100644
--- a/tools/build/tests/ex/ex.c
+++ b/tools/build/tests/ex/ex.c
@@ -5,6 +5,7 @@ int c(void);
 int d(void);
 int e(void);
 int f(void);
+int inc(void);
 
 int main(void)
 {
@@ -14,6 +15,7 @@ int main(void)
 	d();
 	e();
 	f();
+	inc();
 
 	return 0;
 }
diff --git a/tools/build/tests/ex/inc.c b/tools/build/tests/ex/inc.c
new file mode 100644
index 0000000000000000000000000000000000000000..c20f1e9033a365810ce3fc490a8700d9ee89d123
--- /dev/null
+++ b/tools/build/tests/ex/inc.c
@@ -0,0 +1,8 @@
+#ifdef INCLUDE
+#include "krava.h"
+#endif
+
+int inc(void)
+{
+	return 0;
+}
diff --git a/tools/build/tests/run.sh b/tools/build/tests/run.sh
index 5494f8ea75670f91a77034959b32db9a88ceb203..44d2a0fade677b9a456647120d1bb60f3b711aa1 100755
--- a/tools/build/tests/run.sh
+++ b/tools/build/tests/run.sh
@@ -34,9 +34,36 @@ function test_ex_suffix {
 	make -C ex V=1 clean > /dev/null 2>&1
 	rm -f ex.out
 }
+
+function test_ex_include {
+	make -C ex V=1 clean > ex.out 2>&1
+
+	# build with krava.h include
+	touch ex/krava.h
+	make -C ex V=1 CFLAGS=-DINCLUDE >> ex.out 2>&1
+
+	if [ ! -x ./ex/ex ]; then
+	  echo FAILED
+	  exit -1
+	fi
+
+	# build without the include
+	rm -f ex/krava.h ex/ex
+	make -C ex V=1 >> ex.out 2>&1
+
+	if [ ! -x ./ex/ex ]; then
+	  echo FAILED
+	  exit -1
+	fi
+
+	make -C ex V=1 clean > /dev/null 2>&1
+	rm -f ex.out
+}
+
 echo -n Testing..
 
 test_ex
 test_ex_suffix
+test_ex_include
 
 echo OK