diff --git a/jf-assembler/include/EigerAssembler.hpp b/jf-assembler/include/EigerAssembler.hpp
index b07bd8d..6633e1b 100644
--- a/jf-assembler/include/EigerAssembler.hpp
+++ b/jf-assembler/include/EigerAssembler.hpp
@@ -7,6 +7,7 @@
 
 class EigerAssembler {
     const int n_modules_;
+    const int n_rows_;
     const int bit_depth_;
     const int n_eiger_modules_;