diff --git a/classify/intfeaturemap.cpp b/classify/intfeaturemap.cpp
index 79c5040e96..464a9b4fc2 100644
--- a/classify/intfeaturemap.cpp
+++ b/classify/intfeaturemap.cpp
@@ -30,7 +30,6 @@
 namespace tesseract {
 
 const int kMaxOffsetDist = 32;
-const double kMinPCLengthIncrease = 1.0 / 1024;
 
 IntFeatureMap::IntFeatureMap()
   : mapping_changed_(true), compact_size_(0) {