diff --git a/openflow_input/standard-1.4 b/openflow_input/standard-1.4
index 51a1a1906..af657d190 100644
--- a/openflow_input/standard-1.4
+++ b/openflow_input/standard-1.4
@@ -872,8 +872,8 @@ struct of_port_desc_prop_optical : of_port_desc_prop {
     uint32_t rx_min_freq_lmda;
     uint32_t rx_max_freq_lmda;
     uint32_t rx_grid_freq_lmda;
-    uint32_t tx_pwr_min;
-    uint32_t tx_pwr_max;
+    uint16_t tx_pwr_min;
+    uint16_t tx_pwr_max;
 };
 
 struct of_port_desc_prop_experimenter : of_port_desc_prop {
diff --git a/openflow_input/standard-1.5 b/openflow_input/standard-1.5
index a875c5ad7..cf0a8eca5 100644
--- a/openflow_input/standard-1.5
+++ b/openflow_input/standard-1.5
@@ -239,8 +239,8 @@ struct of_port_desc_prop_optical : of_port_desc_prop {
     uint32_t rx_min_freq_lmda;
     uint32_t rx_max_freq_lmda;
     uint32_t rx_grid_freq_lmda;
-    uint32_t tx_pwr_min;
-    uint32_t tx_pwr_max;
+    uint16_t tx_pwr_min;
+    uint16_t tx_pwr_max;
 };
 
 /* Ingress pipeline fields description property */