diff --git a/src/vm_builtins.c b/src/vm_builtins.c
index d61d9e3c..8d870aae 100644
--- a/src/vm_builtins.c
+++ b/src/vm_builtins.c
@@ -7178,6 +7178,21 @@ static RValue builtin_draw_line(VMContext* ctx, RValue* args, MAYBE_UNUSED int32
     return RValue_makeUndefined();
 }
 
+// draw_line_colour(x1, y1, x2, y2, col1, col2)
+static RValue builtin_draw_line_colour(VMContext* ctx, RValue* args, MAYBE_UNUSED int32_t argCount) {
+    Runner* runner = ctx->runner;
+    if (runner->renderer != nullptr) {
+        float x1 = (float) RValue_toReal(args[0]);
+        float y1 = (float) RValue_toReal(args[1]);
+        float x2 = (float) RValue_toReal(args[2]);
+        float y2 = (float) RValue_toReal(args[3]);
+        float col1 = (float) RValue_toReal(args[4]);
+        float col2 = (float) RValue_toReal(args[5]);
+        runner->renderer->vtable->drawLineColor(runner->renderer, x1, y1, x2, y2, 1.0f, col1, col2, runner->renderer->drawAlpha);
+    }
+    return RValue_makeUndefined();
+}
+
 // draw_line_width(x1, y1, x2, y2, w)
 static RValue builtin_draw_line_width(VMContext* ctx, RValue* args, MAYBE_UNUSED int32_t argCount) {
     Runner* runner = ctx->runner;
@@ -11356,6 +11371,8 @@ void VMBuiltins_registerAll(VMContext* ctx) {
     }
     VM_registerBuiltin(ctx, "draw_self", builtin_draw_self);
     VM_registerBuiltin(ctx, "draw_line", builtin_draw_line);
+    VM_registerBuiltin(ctx, "draw_line_colour", builtin_draw_line_colour);
+    VM_registerBuiltin(ctx, "draw_line_color", builtin_draw_line_colour); // alt-spelling (used in Undertale)
     VM_registerBuiltin(ctx, "draw_line_width", builtin_draw_line_width);
     VM_registerBuiltin(ctx, "draw_line_width_colour", builtin_draw_line_width_colour);
     VM_registerBuiltin(ctx, "draw_line_width_color", builtin_draw_line_width_colour);