diff --git a/Tools/VARTest/VARTest.pde b/Tools/VARTest/VARTest.pde
index 6c5232e62e..9ad9f0bdcc 100644
--- a/Tools/VARTest/VARTest.pde
+++ b/Tools/VARTest/VARTest.pde
@@ -135,6 +135,9 @@ void test_variable(AP_Param *ap, enum ap_var_type type)
 	switch (type) {
 	case AP_PARAM_INT8: {
 		AP_Int8 *v = (AP_Int8 *)ap;
+		if (sizeof(*v) != 1) {
+			Debug("incorrect size %u", (unsigned)sizeof(*v));
+		}
 		v->set(value);
 		if (!v->save()) {
 			Debug("failed set_and_save");
@@ -168,6 +171,9 @@ void test_variable(AP_Param *ap, enum ap_var_type type)
 	}
 	case AP_PARAM_INT16: {
 		AP_Int16 *v = (AP_Int16 *)ap;
+		if (sizeof(*v) != 2) {
+			Debug("incorrect size %u", (unsigned)sizeof(*v));
+		}
 		v->set(value);
 		if (!v->save()) {
 			Debug("failed set_and_save");
@@ -201,6 +207,9 @@ void test_variable(AP_Param *ap, enum ap_var_type type)
 	}
 	case AP_PARAM_INT32: {
 		AP_Int32 *v = (AP_Int32 *)ap;
+		if (sizeof(*v) != 4) {
+			Debug("incorrect size %u", (unsigned)sizeof(*v));
+		}
 		v->set(value);
 		if (!v->save()) {
 			Debug("failed set_and_save");
@@ -234,6 +243,9 @@ void test_variable(AP_Param *ap, enum ap_var_type type)
 	}
 	case AP_PARAM_FLOAT: {
 		AP_Float *v = (AP_Float *)ap;
+		if (sizeof(*v) != 4) {
+			Debug("incorrect size %u", (unsigned)sizeof(*v));
+		}
 		v->set(value);
 		if (!v->save()) {
 			Debug("failed set_and_save");
@@ -265,6 +277,27 @@ void test_variable(AP_Param *ap, enum ap_var_type type)
 		}
 		break;
 	}
+	case AP_PARAM_VECTOR3F: {
+		AP_Vector3f *v = (AP_Vector3f *)ap;
+		if (sizeof(*v) != 12) {
+			Debug("incorrect size %u", (unsigned)sizeof(*v));
+		}
+		break;
+	}
+	case AP_PARAM_VECTOR6F: {
+		AP_Vector6f *v = (AP_Vector6f *)ap;
+		if (sizeof(*v) != 24) {
+			Debug("incorrect size %u", (unsigned)sizeof(*v));
+		}
+		break;
+	}
+	case AP_PARAM_MATRIX3F: {
+		AP_Matrix3f *v = (AP_Matrix3f *)ap;
+		if (sizeof(*v) != 36) {
+			Debug("incorrect size %u", (unsigned)sizeof(*v));
+		}
+		break;
+	}
 	default:
 		break;
 	}