diff --git a/src/offset.cc b/src/offset.cc
index 0ad06d08..c604ad64 100644
--- a/src/offset.cc
+++ b/src/offset.cc
@@ -74,7 +74,7 @@ AbstractNode *OffsetModule::instantiate(const Context *ctx, const ModuleInstanti
 	Value join_type = c.lookup_variable("join_type", true);
 	if (join_type.type() == Value::STRING) {
 		std::string jt = join_type.toString();
-		if (std::string("square") == jt) {
+		if (std::string("bevel") == jt) {
 			node->join_type = ClipperLib::jtSquare;
 		} else if (std::string("round") == jt) {
 			node->join_type = ClipperLib::jtRound;
@@ -103,7 +103,7 @@ std::string OffsetNode::toString() const
 		<< "(delta = " << std::dec << this->delta
 		<< ", join_type = "
 			<< (this->join_type == ClipperLib::jtSquare
-				? "square"
+				? "bevel"
 				: this->join_type == ClipperLib::jtRound
 					? "round"
 					: "miter")
diff --git a/testdata/scad/features/offset-tests.scad b/testdata/scad/features/offset-tests.scad
index af6655fc..9e55d584 100644
--- a/testdata/scad/features/offset-tests.scad
+++ b/testdata/scad/features/offset-tests.scad
@@ -23,8 +23,8 @@ offset(delta = 1, join_type = "miter") shape2(1, 2);
 offset(delta = -1, join_type = "miter", miter_limit = 10) shape2(2, 2);
 offset(delta = 1, join_type = "miter", miter_limit = 10) shape2(3, 2);
 
-offset(delta = -1, join_type = "square", miter_limit = 10) shape2(2, -1);
-offset(delta = 1, join_type = "square", miter_limit = 10) shape2(3, -1);
+offset(delta = -1, join_type = "bevel") shape2(2, -1);
+offset(delta = 1, join_type = "bevel") shape2(3, -1);
 
 offset(delta = -5, join_type = "round") shape1(-1, 1);
 shape1(0, 1);