diff --git a/Makefile b/Makefile
index 845a1c16a..2069af4b6 100644
--- a/Makefile
+++ b/Makefile
@@ -204,8 +204,8 @@ check:	all
 dmake:	tools/dmake.cpp
 	$(CXX) -o dmake tools/dmake.cpp cli/filelister.cpp lib/path.cpp -Ilib
 
-reduce:	tools/reduce.cpp
-	$(CXX) -o reduce tools/reduce.cpp -Ilib $(LIBOBJ)
+reduce:	tools/reduce.cpp	$(LIBOBJ)
+	$(CXX) $(CPPFLAGS) $(CXXFLAGS) -o reduce tools/reduce.cpp -Ilib $(LIBOBJ)
 
 clean:
 	rm -f build/*.o lib/*.o cli/*.o test/*.o externals/tinyxml/*.o testrunner cppcheck cppcheck.1
diff --git a/tools/dmake.cpp b/tools/dmake.cpp
index 5443ab9a6..612b35cf4 100644
--- a/tools/dmake.cpp
+++ b/tools/dmake.cpp
@@ -352,8 +352,8 @@ int main(int argc, char **argv)
     fout << "\t./testrunner -g -q\n\n";
     fout << "dmake:\ttools/dmake.cpp\n";
     fout << "\t$(CXX) -o dmake tools/dmake.cpp cli/filelister.cpp lib/path.cpp -Ilib\n\n";
-    fout << "reduce:\ttools/reduce.cpp\n";
-    fout << "\t$(CXX) -o reduce tools/reduce.cpp -Ilib $(LIBOBJ)\n\n";
+    fout << "reduce:\ttools/reduce.cpp\t$(LIBOBJ)\n";
+    fout << "\t$(CXX) $(CPPFLAGS) $(CXXFLAGS) -o reduce tools/reduce.cpp -Ilib $(LIBOBJ)\n\n";
     fout << "clean:\n";
 #ifdef _WIN32
     fout << "\tdel build\\*.o\n\tdel lib\\*.o\n\tdel cli\\*.o\n\tdel test\\*.o\n\tdel *.exe\n";