diff --git a/tests/test_security_null.cpp b/tests/test_security_null.cpp
index 90ad5caa..d6f8beb6 100644
--- a/tests/test_security_null.cpp
+++ b/tests/test_security_null.cpp
@@ -209,7 +209,7 @@ int main (void)
     assert (rc == 0);
 
     struct sockaddr_in ip4addr;
-    int s;
+    fd_t s;
 
     unsigned short int port;
     rc = sscanf (my_endpoint, "tcp://127.0.0.1:%hu", &port);
diff --git a/tests/test_security_plain.cpp b/tests/test_security_plain.cpp
index 8542c323..1ca2e5ad 100644
--- a/tests/test_security_plain.cpp
+++ b/tests/test_security_plain.cpp
@@ -170,7 +170,7 @@ int main (void)
 
     // Unauthenticated messages from a vanilla socket shouldn't be received
     struct sockaddr_in ip4addr;
-    int s;
+    fd_t s;
 
     unsigned short int port;
     rc = sscanf (my_endpoint, "tcp://127.0.0.1:%hu", &port);