diff --git a/src/p_lx_elf.cpp b/src/p_lx_elf.cpp
index ebb1a78b..6f3bed95 100644
--- a/src/p_lx_elf.cpp
+++ b/src/p_lx_elf.cpp
@@ -1704,6 +1704,8 @@ PackLinuxElf32::buildLinuxLoader(
     relocateLoader();
 }
 
+unsigned bb1;  // aid for possible debugging NRV/UCL
+
 void
 PackLinuxElf64::buildLinuxLoader(
     upx_byte const *const proto,