diff --git a/build.sh b/build.sh
index 74d0fd4..6e501db 100755
--- a/build.sh
+++ b/build.sh
@@ -5,8 +5,8 @@ cargo test --features c-headers -- generate_headers
 # cc
 export LD_LIBRARY_PATH=`pwd`/target/debug
 cc cc/bdk_ffi_test.c -o cc/bdk_ffi_test -L target/debug -l bdk_ffi -l pthread -l dl -l m
-#valgrind --leak-check=full cc/bdk_ffi_test
-cc/bdk_ffi_test
+valgrind --leak-check=full cc/bdk_ffi_test
+#cc/bdk_ffi_test
 
 # bdk-kotlin
 mkdir -p bdk-kotlin/jar/libs/x86_64_linux
diff --git a/cc/bdk_ffi_test.c b/cc/bdk_ffi_test.c
index 83ed17d..48cc0fd 100644
--- a/cc/bdk_ffi_test.c
+++ b/cc/bdk_ffi_test.c
@@ -35,8 +35,11 @@ int main (int argc, char const * const argv[])
         // test free_wallet NULL doesn't crash
         free_wallet(NULL);
         
-        // verify sync_wallet after sync_wallet fails (double free detected, core dumped)
-        ////sync_wallet(&wallet);
+        // verify free_wallet after free_wallet fails (core dumped)
+        ////free_wallet(wallet);
+        
+        // verify sync_wallet after free_wallet fails (core dumped)
+        ////sync_wallet(wallet);
     }
         
     return EXIT_SUCCESS;