diff --git a/lib/st25r3911b/st25r3911b_common.c b/lib/st25r3911b/st25r3911b_common.c
index 5fe099e1c853..4dce97059fcf 100644
--- a/lib/st25r3911b/st25r3911b_common.c
+++ b/lib/st25r3911b/st25r3911b_common.c
@@ -31,7 +31,7 @@ LOG_MODULE_DECLARE(st25r3911b);
 #define POWER_SUPP_5V_STEP 120
 #define POWER_SUPP_MEAS_INTEGER 23
 #define POWER_SUPP_MEAS_FRACTION 438
-#define POWER_SUPP_MEAS_FRACTION_DIVISOR 100
+#define POWER_SUPP_MEAS_FRACTION_DIVISOR 1000
 #define REGULATOR_INIT_REG_VALUE 5
 
 #define FIELD_THRESHOLD_TRG_DEFAULT 0x30