diff --git a/test/Big.cpp b/test/Big.cpp
index 86776c2..b049496 100644
--- a/test/Big.cpp
+++ b/test/Big.cpp
@@ -67,8 +67,9 @@ TEST_CASE("Mul", "[big]") {
 
         Mul(a->Primary(), b->Primary(), c);
 
-        CHECK(a->Primary().Count() == 1);
-        CHECK(a->Primary()[0] == 0);
+        a->Primary().Trim();
+
+        CHECK(a->Primary().Count() == 0);
 
         SBigDel(a);
         SBigDel(b);
@@ -86,6 +87,8 @@ TEST_CASE("Mul", "[big]") {
 
         Mul(a->Primary(), b->Primary(), c);
 
+        a->Primary().Trim();
+
         CHECK(a->Primary().Count() == 1);
         CHECK(a->Primary()[0] == 8);
 
@@ -105,6 +108,8 @@ TEST_CASE("Mul", "[big]") {
 
         Mul(a->Primary(), b->Primary(), c);
 
+        a->Primary().Trim();
+
         CHECK(a->Primary().Count() == 2);
         CHECK(a->Primary()[0] == 0xFFFFFF00);
         CHECK(a->Primary()[1] == 0xFF);