diff --git a/src/color.cc b/src/color.cc
index 4220396d..acca652c 100644
--- a/src/color.cc
+++ b/src/color.cc
@@ -64,8 +64,11 @@ AbstractNode *ColorModule::evaluate(const Context *ctx, const ModuleInstantiatio
 
 	Value v = c.lookup_variable("c");
 	if (v.type() == Value::VECTOR) {
-		for (size_t i = 0; i < 4; i++)
+		for (size_t i = 0; i < 4; i++) {
 			node->color[i] = i < v.toVector().size() ? v.toVector()[i].toDouble() : 1.0;
+			if (node->color[i] > 1)
+				PRINTB_NOCACHE("WARNING: color() expects numbers between 0.0 and 1.0. Value of %.1f is too large.", node->color[i]);
+		}
 	} else if (v.type() == Value::STRING) {
 		std::string colorname = v.toString();
 		boost::algorithm::to_lower(colorname);