diff --git a/tests/test_toolkit.cpp b/tests/test_toolkit.cpp
index 3c7aa5b..433614e 100644
--- a/tests/test_toolkit.cpp
+++ b/tests/test_toolkit.cpp
@@ -207,13 +207,14 @@ BOOST_FIXTURE_TEST_CASE(test_progressive_stepping, Fixture)
 BOOST_FIXTURE_TEST_CASE(test_addpattern, Fixture)
 {
     int pat_index, n_patterns_1, n_patterns_2;
+    char newpat[] = "new_pattern";
     
     // get the number of current patterns
     error = EN_getcount(ph, EN_PATCOUNT, &n_patterns_1);
     BOOST_REQUIRE(error == 0);
     
     // add a new pattern
-    error = EN_addpattern(ph, 'new_pattern');
+    error = EN_addpattern(ph, newpat);
     BOOST_REQUIRE(error == 0);
 
     // get the new patterns count, shoul dbe the old one + 1
@@ -222,7 +223,7 @@ BOOST_FIXTURE_TEST_CASE(test_addpattern, Fixture)
     BOOST_REQUIRE(n_patterns_1 + 1 == n_patterns_2);
     
     // gwt the new patterns index, should be as the number of patterns
-    error = EN_getpatternindex(ph, 'new_pattern', &pat_index);
+    error = EN_getpatternindex(ph, newpat, &pat_index);
     BOOST_REQUIRE(pat_index == n_patterns_2);
 }