diff --git a/crypto/Makefile b/crypto/Makefile
index 26d0bccf6..4b794006b 100644
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -124,8 +124,8 @@ fuzzer: fuzzer/fuzzer.o $(OBJS)
 	$(CC) $(CFLAGS) fuzzer/fuzzer.o $(OBJS) -o fuzzer/fuzzer
 
 clean:
-	rm -f *.o aes/*.o chacha20poly1305/*.o ed25519-donna/*.o
-	rm -f tests/test_check tests/test_speed tests/test_openssl tests/libtrezor-crypto.so tests/aestst
+	rm -f *.o aes/*.o chacha20poly1305/*.o ed25519-donna/*.o monero/*.o
+	rm -f tests/*.o tests/test_check tests/test_speed tests/test_openssl tests/libtrezor-crypto.so tests/aestst
 	rm -f tools/*.o tools/xpubaddrgen tools/mktable tools/bip39bruteforce
 	rm -f fuzzer/*.o fuzzer/fuzzer
 
diff --git a/crypto/aes/aestst.c b/crypto/aes/aestst.c
index 9b8097c4e..90a8714a9 100644
--- a/crypto/aes/aestst.c
+++ b/crypto/aes/aestst.c
@@ -108,8 +108,12 @@ void cycles(volatile uint64_t *rtn)
         cpuid
     }
 #elif defined( __GNUC__ )
+#if defined(__aarch64__)
+    __asm__ __volatile__("mrs %0, cntvct_el0": "=r" (*rtn));
+#else
     __asm__ __volatile__("rdtsc": "=A" (*rtn));
 #endif
+#endif
 }
 
 int main(void)
diff --git a/crypto/chacha20poly1305/chacha_merged.c b/crypto/chacha20poly1305/chacha_merged.c
index 2ad260d60..7989f0c01 100644
--- a/crypto/chacha20poly1305/chacha_merged.c
+++ b/crypto/chacha20poly1305/chacha_merged.c
@@ -29,7 +29,7 @@ static const char tau[16] = "expand 16-byte k";
 void ECRYPT_keysetup(ECRYPT_ctx *x,const u8 *k,u32 kbits,u32 ivbits)
 {
   (void)ivbits;
-  const char *constants = NULL;
+  const char *constants = (const char *)0;
 
   x->input[4] = U8TO32_LITTLE(k + 0);
   x->input[5] = U8TO32_LITTLE(k + 4);
diff --git a/crypto/groestl_internal.h b/crypto/groestl_internal.h
index 3fdd710f0..3c675d8ea 100644
--- a/crypto/groestl_internal.h
+++ b/crypto/groestl_internal.h
@@ -106,6 +106,14 @@ typedef int64_t sph_s64;
 #define SPH_DETECT_LITTLE_ENDIAN     1
 #define SPH_DETECT_BIG_ENDIAN        0
 
+/*
+ * ARM64, little-endian.
+ */
+#elif defined __aarch64__
+
+#define SPH_DETECT_LITTLE_ENDIAN     1
+#define SPH_DETECT_BIG_ENDIAN        0
+
 #endif