diff --git a/bindings/java/src/org/hyperic/sigar/test/TestPTQL.java b/bindings/java/src/org/hyperic/sigar/test/TestPTQL.java
index d0bc90b8..009a901f 100644
--- a/bindings/java/src/org/hyperic/sigar/test/TestPTQL.java
+++ b/bindings/java/src/org/hyperic/sigar/test/TestPTQL.java
@@ -100,6 +100,7 @@ public class TestPTQL extends SigarTestCase {
         "Pid.Pid.eq=foo",
         "Cpu.Percent.ge=x",
         "Port.foo.eq=8080",
+        "Port.tcp.gt=8080",
         "",
         null,
         //disabled for testing w/ -Dsigar.ptql.native=true
diff --git a/src/sigar_ptql.c b/src/sigar_ptql.c
index ec333b84..409a8a56 100644
--- a/src/sigar_ptql.c
+++ b/src/sigar_ptql.c
@@ -856,6 +856,11 @@ static int ptql_env_match(sigar_t *sigar,
 static int ptql_branch_init_port(ptql_parse_branch_t *parsed,
                                  ptql_branch_t *branch)
 {
+    /* only 'eq' is supported here */
+    if (branch->op_name != PTQL_OP_EQ) {
+        return SIGAR_PTQL_MALFORMED_QUERY;
+    }
+
     if (strEQ(parsed->attr, "tcp")) {
         branch->flags = SIGAR_NETCONN_TCP;
     }