diff --git a/src/build_rust.sh b/src/build_rust.sh
index bebc1c58..253d13da 100755
--- a/src/build_rust.sh
+++ b/src/build_rust.sh
@@ -60,6 +60,10 @@ for prog in $PROGS
 do
     pushd $prog > /dev/null
     cargo build $BUILD_FLAGS
+    if [ $? -ne 0 ]; then
+      echo "Cargo build failed. Exiting with code 1."
+    exit 1
+    fi    
     popd > /dev/null
 done
 
diff --git a/src/rust/lqos_sys/src/bpf/lqos_kern.c b/src/rust/lqos_sys/src/bpf/lqos_kern.c
index c4980a69..06a323c2 100644
--- a/src/rust/lqos_sys/src/bpf/lqos_kern.c
+++ b/src/rust/lqos_sys/src/bpf/lqos_kern.c
@@ -359,7 +359,7 @@ int throughput_reader(struct bpf_iter__bpf_map_elem *ctx)
 
     bpf_seq_write(seq, ip, sizeof(struct in6_addr));
     for (__u32 i=0; i<NUM_CPUS; i++) {
-        struct host_counter * content = counter+(i*48);
+        struct host_counter * content = counter+(i*sizeof(struct host_counter));
         bpf_seq_write(seq, content, sizeof(struct host_counter));
     }