diff --git a/src/p_lx_elf.cpp b/src/p_lx_elf.cpp
index 6097151f..e940fc69 100644
--- a/src/p_lx_elf.cpp
+++ b/src/p_lx_elf.cpp
@@ -516,7 +516,7 @@ void PackLinuxElf64::pack3(OutputFile *fo, Filter &ft)
 void
 PackLinuxElf::addStubEntrySections(Filter const *)
 {
-    int all_pages = opt->o_unix.unmap_all_pages | is_big;
+    bool all_pages = opt->o_unix.unmap_all_pages | is_big;
     addLoader("ELFMAINX", NULL);
     if (hasLoaderSection("ELFMAINXu")) {
             // brk() trouble if static
diff --git a/src/p_lx_elf.h b/src/p_lx_elf.h
index f70de120..df36d5ad 100644
--- a/src/p_lx_elf.h
+++ b/src/p_lx_elf.h
@@ -81,7 +81,7 @@ protected:
     unsigned sz_pack2a;  // after pack2() of all PT_LOAD
     unsigned lg2_page;  // log2(PAGE_SIZE)
     unsigned page_size;  // 1u<<lg2_page
-    unsigned is_big;  // stub style: must use area above the brk
+    bool is_big;  // stub style: must use area above the brk
     unsigned xct_off;  // shared library: file offset of SHT_EXECINSTR
     unsigned hatch_off;  // file offset of escape hatch
     upx_uint64_t load_va;  // PT_LOAD[0].p_vaddr