diff --git a/unittest/unittest.cbp b/unittest/unittest.cbp
index 7f9621b..a211d6b 100644
--- a/unittest/unittest.cbp
+++ b/unittest/unittest.cbp
@@ -13,6 +13,8 @@
 				<Option compiler="gcc" />
 				<Compiler>
 					<Add option="-g" />
+					<Add option="-DDOCTEST_CONFIG_NO_MULTITHREADING" />
+					<Add option="-DDOCTEST_CONFIG_IMPLEMENT_WITH_MAIN" />
 				</Compiler>
 			</Target>
 			<Target title="Release">
@@ -31,6 +33,10 @@
 		<Compiler>
 			<Add option="-Wall" />
 		</Compiler>
+		<Unit filename="../doctest.h" />
+		<Unit filename="../histogram.cpp" />
+		<Unit filename="../histogram_internal.h" />
+		<Unit filename="../unittest.cpp" />
 		<Extensions>
 			<lib_finder disable_auto="1" />
 		</Extensions>