diff --git a/charsetdetect-ae.cabal b/charsetdetect-ae.cabal
--- a/charsetdetect-ae.cabal
+++ b/charsetdetect-ae.cabal
@@ -1,5 +1,5 @@
 Name:                charsetdetect-ae
-Version:             1.1.0.3
+Version:             1.1.0.4
 Cabal-Version:       >= 1.6
 Category:            Text
 Synopsis:            Character set detection using Mozilla's Universal Character Set Detector
diff --git a/libcharsetdetect/nspr-emu/prcpucfg_linux.h b/libcharsetdetect/nspr-emu/prcpucfg_linux.h
--- a/libcharsetdetect/nspr-emu/prcpucfg_linux.h
+++ b/libcharsetdetect/nspr-emu/prcpucfg_linux.h
@@ -509,6 +509,59 @@
 #define PR_BYTES_PER_WORD_LOG2   2
 #define PR_BYTES_PER_DWORD_LOG2  3
 
+#elif defined(__aarch64__)
+
+#ifdef __AARCH64EB__
+#undef  IS_LITTLE_ENDIAN
+#define IS_BIG_ENDIAN 1
+#elif defined(__AARCH64EL__)
+#define IS_LITTLE_ENDIAN 1
+#undef  IS_BIG_ENDIAN
+#else
+#error "Unknown Aarch64 endianness."
+#endif
+#define IS_64
+
+#define PR_BYTES_PER_BYTE   1
+#define PR_BYTES_PER_SHORT  2
+#define PR_BYTES_PER_INT    4
+#define PR_BYTES_PER_INT64  8
+#define PR_BYTES_PER_LONG   8
+#define PR_BYTES_PER_FLOAT  4
+#define PR_BYTES_PER_DOUBLE 8
+#define PR_BYTES_PER_WORD   8
+#define PR_BYTES_PER_DWORD  8
+
+#define PR_BITS_PER_BYTE    8
+#define PR_BITS_PER_SHORT   16
+#define PR_BITS_PER_INT     32
+#define PR_BITS_PER_INT64   64
+#define PR_BITS_PER_LONG    64
+#define PR_BITS_PER_FLOAT   32
+#define PR_BITS_PER_DOUBLE  64
+#define PR_BITS_PER_WORD    64
+
+#define PR_BITS_PER_BYTE_LOG2   3
+#define PR_BITS_PER_SHORT_LOG2  4
+#define PR_BITS_PER_INT_LOG2    5
+#define PR_BITS_PER_INT64_LOG2  6
+#define PR_BITS_PER_LONG_LOG2   6
+#define PR_BITS_PER_FLOAT_LOG2  5
+#define PR_BITS_PER_DOUBLE_LOG2 6
+#define PR_BITS_PER_WORD_LOG2   6
+
+#define PR_ALIGN_OF_SHORT   2
+#define PR_ALIGN_OF_INT     4
+#define PR_ALIGN_OF_LONG    8
+#define PR_ALIGN_OF_INT64   8
+#define PR_ALIGN_OF_FLOAT   4
+#define PR_ALIGN_OF_DOUBLE  8
+#define PR_ALIGN_OF_POINTER 8
+#define PR_ALIGN_OF_WORD    8
+
+#define PR_BYTES_PER_WORD_LOG2  3
+#define PR_BYTES_PER_DWORD_LOG2 3
+
 #elif defined(__hppa__)
 
 #undef  IS_LITTLE_ENDIAN