diff --git a/rules/net_if/tgt_refcount.rs b/rules/net_if/tgt_refcount.rs
new file mode 100644
index 00000000..46fd4e58
--- /dev/null
+++ b/rules/net_if/tgt_refcount.rs
@@ -0,0 +1,14 @@
+// Copyright (c) 2022-present INESC-ID.
+// Distributed under the MIT license that can be found in the LICENSE file.
+
+use libcc2rs::*;
+
+fn f1(a0: Ptr<u8>) -> u32 {
+    match nix::net::if_::if_nametoindex(a0.to_rust_string().as_str()) {
+        Ok(__i) => __i,
+        Err(__e) => {
+            libcc2rs::cpp2rust_errno().write(__e as i32);
+            0
+        }
+    }
+}
diff --git a/rules/src/modules.rs b/rules/src/modules.rs
index f91da1da..9228261b 100644
--- a/rules/src/modules.rs
+++ b/rules/src/modules.rs
@@ -94,6 +94,8 @@ pub mod map_tgt_refcount;
 pub mod map_tgt_unsafe;
 #[path = r#"../math/tgt_unsafe.rs"#]
 pub mod math_tgt_unsafe;
+#[path = r#"../net_if/tgt_refcount.rs"#]
+pub mod net_if_tgt_refcount;
 #[path = r#"../net_if/tgt_unsafe.rs"#]
 pub mod net_if_tgt_unsafe;
 #[path = r#"../netdb/tgt_refcount.rs"#]
diff --git a/tests/unit/ifaddrs.c b/tests/unit/ifaddrs.c
index 0b5e80a5..aa3f8176 100644
--- a/tests/unit/ifaddrs.c
+++ b/tests/unit/ifaddrs.c
@@ -1,5 +1,6 @@
 #include <assert.h>
 #include <ifaddrs.h>
+#include <net/if.h>
 #include <netinet/in.h>
 #include <string.h>
 #include <sys/socket.h>
@@ -28,9 +29,12 @@ int main(void) {
       struct sockaddr_in *mask = (struct sockaddr_in *)ifa->ifa_netmask;
       unsigned char mask_be[4] = {255, 0, 0, 0};
       assert(memcmp(&mask->sin_addr, mask_be, 4) == 0);
+      assert(if_nametoindex(ifa->ifa_name) > 0);
     }
   }
   assert(found_loopback);
   freeifaddrs(list);
+
+  assert(if_nametoindex("cpp2rust_no_such_if") == 0);
   return 0;
 }
diff --git a/tests/unit/out/refcount/ifaddrs.rs b/tests/unit/out/refcount/ifaddrs.rs
index 3e533a0b..20dc87a9 100644
--- a/tests/unit/out/refcount/ifaddrs.rs
+++ b/tests/unit/out/refcount/ifaddrs.rs
@@ -104,6 +104,20 @@ fn main_0() -> i32 {
                     == 0) as i32)
                     != 0)
             );
+            assert!(
+                (((match nix::net::if_::if_nametoindex(
+                    (*(*(*ifa.borrow()).upgrade().deref()).ifa_name.borrow())
+                        .to_rust_string()
+                        .as_str()
+                ) {
+                    Ok(__i) => __i,
+                    Err(__e) => {
+                        libcc2rs::cpp2rust_errno().write(__e as i32);
+                        0
+                    }
+                } > 0_u32) as i32)
+                    != 0)
+            );
         }
         let __rhs = (*(*(*ifa.borrow()).upgrade().deref()).ifa_next.borrow()).clone();
         (*ifa.borrow_mut()) = __rhs;
@@ -131,5 +145,19 @@ fn main_0() -> i32 {
             __cur = __next;
         }
     };
+    assert!(
+        (((match nix::net::if_::if_nametoindex(
+            Ptr::from_string_literal(b"cpp2rust_no_such_if")
+                .to_rust_string()
+                .as_str()
+        ) {
+            Ok(__i) => __i,
+            Err(__e) => {
+                libcc2rs::cpp2rust_errno().write(__e as i32);
+                0
+            }
+        } == 0_u32) as i32)
+            != 0)
+    );
     return 0;
 }
diff --git a/tests/unit/out/unsafe/ifaddrs.rs b/tests/unit/out/unsafe/ifaddrs.rs
index 9244e84e..44c3636e 100644
--- a/tests/unit/out/unsafe/ifaddrs.rs
+++ b/tests/unit/out/unsafe/ifaddrs.rs
@@ -79,10 +79,18 @@ unsafe fn main_0() -> i32 {
                 }) == (0)) as i32)
                     != 0)
             );
+            assert!(
+                ((((libc::if_nametoindex(((*ifa).ifa_name).cast_const())) > (0_u32)) as i32) != 0)
+            );
         }
         ifa = (*ifa).ifa_next;
     }
     assert!((found_loopback != 0));
     libc::freeifaddrs(list);
+    assert!(
+        ((((libc::if_nametoindex((c"cpp2rust_no_such_if".as_ptr().cast_mut()).cast_const()))
+            == (0_u32)) as i32)
+            != 0)
+    );
     return 0;
 }