diff --git a/src/p_lx_elf.cpp b/src/p_lx_elf.cpp
index 2b73823d..feed84da 100644
--- a/src/p_lx_elf.cpp
+++ b/src/p_lx_elf.cpp
@@ -3843,7 +3843,7 @@ PackLinuxElf64::check_pt_dynamic(Elf64_Phdr const *const phdr)
 {
     upx_uint64_t t = get_te64(&phdr->p_offset), s = sizeof(Elf64_Dyn) + t;
     upx_uint64_t filesz = get_te64(&phdr->p_filesz), memsz = get_te64(&phdr->p_memsz);
-    if (s < t || (uint64_t)file_size < s
+    if (s < t || (upx_uint64_t)file_size < s
     ||  (7 & t) || (0xf & (filesz | memsz))  // .balign 8; 16==sizeof(Elf64_Dyn)
     ||  filesz < sizeof(Elf64_Dyn)
     ||  memsz  < sizeof(Elf64_Dyn)
diff --git a/src/pefile.cpp b/src/pefile.cpp
index a9bb2ab8..3a9e942d 100644
--- a/src/pefile.cpp
+++ b/src/pefile.cpp
@@ -167,7 +167,7 @@ int PeFile::readFileHeader()
                 : (h.p512*512+h.m512 - h.m512 ? 512 : 0);
 
             if ((pe_offset + delta) < delta  // wrap-around
-            ||  (pe_offset + delta) > file_size) {
+            ||  (pe_offset + delta) > (unsigned)file_size) {
                 char buf[64]; snprintf(buf, sizeof(buf),
                     "bad PE delta %#x at offset %#x", delta, pe_offset);
                 throwCantPack(buf);