diff --git a/src/interface.c b/src/interface.c
index 280c885..3fc61a6 100644
--- a/src/interface.c
+++ b/src/interface.c
@@ -68,11 +68,35 @@ GroundValue groundCreateValue(GroundValueType type, ...) {
             return createListGroundValue(va_arg(args, List));
             break;
         }
+        case FUNCTION: {
+            return createFunctionGroundValue(va_arg(args, GroundFunction*));
+            break;
+        }
+        case STRUCTVAL: {
+            GroundValue gv;
+            gv.type = STRUCTVAL;
+            gv.data.structVal = va_arg(args, GroundStruct*);
+            return gv;
+            break;
+        }
+        case NONE: {
+            return createNoneGroundValue();
+            break;
+        }
+        case ERROR:
+        case CUSTOM: {
+            // FIXME
+            break;
+        }
+        /*
         default: {
             return createNoneGroundValue();
         }
+        */
     }
 
+    return createNoneGroundValue();
+
     va_end(args);
 }