diff --git a/test/mip_test.cc b/test/mip_test.cc
--- a/test/mip_test.cc
+++ b/test/mip_test.cc
@@ -115,6 +115,7 @@
     GlpkMip mip1;
     aTest(mip1);
   }
+  GlpkLp::freeEnv();
 #endif
 
 #ifdef HAVE_CPLEX