diff --git a/soc/arm/microchip_mec/mec172x/reg/mec172x_espi_iom.h b/soc/arm/microchip_mec/mec172x/reg/mec172x_espi_iom.h
index 2f50390d16b..8c58626d7af 100644
--- a/soc/arm/microchip_mec/mec172x/reg/mec172x_espi_iom.h
+++ b/soc/arm/microchip_mec/mec172x/reg/mec172x_espi_iom.h
@@ -385,7 +385,8 @@
 #define MCHP_ESPI_FC_CTRL_ERS0		0x02u
 #define MCHP_ESPI_FC_CTRL_ERL0		0x03u
 #define MCHP_ESPI_FC_CTRL_FUNC(f)	\
-	((uint32_t)(f) & MCHP_ESPI_FC_CTRL_FUNC_MASK)
+	SHLU32((uint32_t)(f), MCHP_ESPI_FC_CTRL_FUNC_POS) & \
+	MCHP_ESPI_FC_CTRL_FUNC_MASK
 
 #define MCHP_ESPI_FC_CTRL_TAG_POS	4u
 #define MCHP_ESPI_FC_CTRL_TAG_MASK0	0x0fu