diff --git a/src/fdr/fdr_confirm_compile.cpp b/src/fdr/fdr_confirm_compile.cpp
index 319141c4..b14ffb42 100644
--- a/src/fdr/fdr_confirm_compile.cpp
+++ b/src/fdr/fdr_confirm_compile.cpp
@@ -163,7 +163,7 @@ bytecode_ptr<FDRConfirm> getFDRConfirm(const vector<hwlmLiteral> &lits,
     if (make_small) {
         nBits = min(10U, lg2(lits.size()) + 1);
     } else {
-        nBits = lg2(lits.size() + 4);
+        nBits = lg2(lits.size()) + 4;
     }
 
     CONF_TYPE mult = (CONF_TYPE)0x0b4e0ef37bc32127ULL;