diff --git a/src/stub/amd64-darwin.macho-upxmain.exe b/src/stub/amd64-darwin.macho-upxmain.exe
index 782637bd..e5092ccd 100644
Binary files a/src/stub/amd64-darwin.macho-upxmain.exe and b/src/stub/amd64-darwin.macho-upxmain.exe differ
diff --git a/src/stub/amd64-darwin.macho-upxmain.h b/src/stub/amd64-darwin.macho-upxmain.h
index c856b624..beffec59 100644
--- a/src/stub/amd64-darwin.macho-upxmain.h
+++ b/src/stub/amd64-darwin.macho-upxmain.h
@@ -32,8 +32,8 @@
 
 
 #define STUB_AMD64_DARWIN_MACHO_UPXMAIN_EXE_SIZE    4136
-#define STUB_AMD64_DARWIN_MACHO_UPXMAIN_EXE_ADLER32 0x0ba0fe1b
-#define STUB_AMD64_DARWIN_MACHO_UPXMAIN_EXE_CRC32   0x87768003
+#define STUB_AMD64_DARWIN_MACHO_UPXMAIN_EXE_ADLER32 0xb100fe8b
+#define STUB_AMD64_DARWIN_MACHO_UPXMAIN_EXE_CRC32   0xf5a9d4fb
 
 unsigned char stub_amd64_darwin_macho_upxmain_exe[4136] = {
 /* 0x0000 */ 207,250,237,254,  7,  0,  0,  1,  3,  0,  0,128,  2,  0,  0,  0,
@@ -265,18 +265,18 @@ unsigned char stub_amd64_darwin_macho_upxmain_exe[4136] = {
 /* 0x0e20 */   1,205, 65, 57,223, 15,130,217,253,255,255, 72,131,196,120, 91,
 /* 0x0e30 */  65, 92, 65, 93, 65, 94, 65, 95, 93,195,191,127,  0,  0,  0,232,
 /* 0x0e40 */  50,  1,  0,  0, 85, 72,137,229, 65, 87, 65, 86, 65, 85, 65, 84,
-/* 0x0e50 */  83, 72,129,236, 24,  8,  0,  0, 68,139,109,  8, 76,141,101, 16,
+/* 0x0e50 */  83, 72,129,236, 24, 64,  0,  0, 68,139,109,  8, 76,141,101, 16,
 /* 0x0e60 */  72,141,  5,221,255,255,255, 72, 37,  0,  0,255,255,139, 72, 16,
 /* 0x0e70 */ 133,201,116, 72, 72,131,200, 32, 49,210, 72,190, 76, 73, 78, 75,
 /* 0x0e80 */  69, 68, 73, 84,131, 56, 25,117,  6, 72, 57,112, 10,116, 14,255,
 /* 0x0e90 */ 194,139,120,  4, 72,  1,248, 57,202,114,233,235, 31, 72,139, 88,
 /* 0x0ea0 */  24, 68, 15,183,  3, 73,  1,216, 76,141, 75,  2, 68,139,115,252,
 /* 0x0eb0 */  72,131,195,252, 77,133,246,116,243, 76, 41,243, 76,137,224, 72,
-/* 0x0ec0 */ 131,192,240, 72,137,  4, 36, 72,141,149,208,247,255,255,185,  0,
-/* 0x0ed0 */   8,  0,  0, 72,137,223, 76,137,246,232, 31,250,255,255, 73,137,
+/* 0x0ec0 */ 131,192,240, 72,137,  4, 36, 72,141,149,208,191,255,255,185,  0,
+/* 0x0ed0 */  64,  0,  0, 72,137,223, 76,137,246,232, 31,250,255,255, 73,137,
 /* 0x0ee0 */ 199, 72,137,223, 76,137,246,232,146,  0,  0,  0, 73, 99,197, 73,
 /* 0x0ef0 */ 137, 68, 36,248, 73,141,100, 36,240, 65,255,231, 49,192, 72,129,
-/* 0x0f00 */ 196, 24,  8,  0,  0, 91, 65, 92, 65, 93, 65, 94, 65, 95, 93,195,
+/* 0x0f00 */ 196, 24, 64,  0,  0, 91, 65, 92, 65, 93, 65, 94, 65, 95, 93,195,
 /* 0x0f10 */  72,139, 15, 72, 57,209,114, 52, 72,139, 71,  8, 72,133,210,116,
 /* 0x0f20 */  29, 72,137,209, 72,255,201, 68,138,  0, 72,141, 64,  1, 68,136,
 /* 0x0f30 */   6, 72,141,118,  1,117,237, 72,139, 15, 72,139, 71,  8, 72,  1,
diff --git a/src/stub/src/amd64-darwin.macho-upxmain.c b/src/stub/src/amd64-darwin.macho-upxmain.c
index 56a89053..4d792c81 100644
--- a/src/stub/src/amd64-darwin.macho-upxmain.c
+++ b/src/stub/src/amd64-darwin.macho-upxmain.c
@@ -659,8 +659,7 @@ upx_main(
             err_exit(18);
         }
         for (;;) { // possibly 2 times for 'fat' binary
-            unsigned const fatmax = sizeof(Fat_header) + 10 * sizeof(Fat_arch);
-            if (fatmax!=pread(fdi, (void *)mhdr, fatmax, fat_offset)) {
+            if (sz_mhdr!=pread(fdi, (void *)mhdr, sz_mhdr, fat_offset)) {
 ERR_LAB
                 err_exit(19);
             }