diff --git a/core/src/main/java/com/google/zxing/pdf417/decoder/ec/ModulusGF.java b/core/src/main/java/com/google/zxing/pdf417/decoder/ec/ModulusGF.java
index cc50fe1fb..535ba02f2 100644
--- a/core/src/main/java/com/google/zxing/pdf417/decoder/ec/ModulusGF.java
+++ b/core/src/main/java/com/google/zxing/pdf417/decoder/ec/ModulusGF.java
@@ -43,7 +43,7 @@ public final class ModulusGF {
       expTable[i] = x;
       x = (x * generator) % modulus;
     }
-    for (int i = 0; i < modulus - e1; i++) {
+    for (int i = 0; i < modulus - 1; i++) {
       logTable[expTable[i]] = i;
     }
     // logTable[0] == 0 but this should never be used