diff --git a/svg.cpp b/svg.cpp
index 4d1c48d..26e2fe7 100644
--- a/svg.cpp
+++ b/svg.cpp
@@ -9,7 +9,7 @@ void svg_text(double left, double baseline, string text) {
     cout << "<text x='" << left << "' y='" << baseline << "'>" << text << "</text>";
 }
 
-void svg_rect(double x, double y, double width, double height, string stroke = "black", string fill = "black") {
+void svg_rect(double x, double y, double width, double height, string stroke, string fill) {
     cout << "<rect x='" << x << "' y='" << y << "' width='" << width << "' height='" << height << "' fill='" << fill << "' stroke='" << stroke << "' />\n";
 }
 
diff --git a/unittest.cpp b/unittest.cpp
index c0d3446..95dbccd 100644
--- a/unittest.cpp
+++ b/unittest.cpp
@@ -47,4 +47,5 @@ TEST_CASE("Invalid color with spaces") {
 }
 
 TEST_CASE("Valid color not starting with #") {
-    CHECK(check_color("FFFFFF") == "FFFFFF");
\ No newline at end of file
+    CHECK(check_color("FFFFFF") == "FFFFFF");
+}
\ No newline at end of file