diff --git a/ft8/decode.c b/ft8/decode.c
index 4334543..efb1718 100644
--- a/ft8/decode.c
+++ b/ft8/decode.c
@@ -13,7 +13,7 @@
 //   y - increase in signal level dB when adding a weaker independent signal
 //   x - specific relative strength of the weaker signal in dB
 // Table index corresponds to x in dB (index 0: 0 dB, index 1: -1 dB etc)
-const float db_power_sum[] = {
+static const float db_power_sum[40] = {
     3.01029995663981f, 2.53901891043867f, 2.1244260279434f, 1.76434862436485f, 1.45540463109294f,
     1.19331048066095f, 0.973227937086954f, 0.790097496525665f, 0.638920341433796f, 0.514969420252302f,
     0.413926851582251f, 0.331956199884278f, 0.265723755961025f, 0.212384019142551f, 0.16954289279533f,