diff --git a/release_notes.md b/release_notes.md
index bc93e143a6c..21fffab70c6 100644
--- a/release_notes.md
+++ b/release_notes.md
@@ -1,3 +1,11 @@
+# NEXT RELEASE
+
+### Bugfixes:
+
+* Fixed encryption on Android ARM64 devices.
+
+----------------------------------------------
+
 # 0.89.1 Release notes
 
 ### Bugfixes:
diff --git a/src/realm/util/file_mapper.cpp b/src/realm/util/file_mapper.cpp
index aad82858af4..2c5e0ce6953 100644
--- a/src/realm/util/file_mapper.cpp
+++ b/src/realm/util/file_mapper.cpp
@@ -47,6 +47,11 @@
 #   include <mach/exc.h>
 #endif
 
+#ifdef REALM_ANDROID
+#include <linux/unistd.h>
+#include <sys/syscall.h>
+#endif
+
 using namespace realm;
 using namespace realm::util;
 
@@ -364,6 +369,27 @@ void install_handler()
 
 #else // __APPLE__
 
+#if defined(REALM_ANDROID) && defined(__LP64__)
+// bionic's sigaction() is broken on arm64, so use the syscall directly
+int sigaction_wrapper(int signal, const struct sigaction* new_action, struct sigaction* old_action) {
+    __kernel_sigaction kernel_new_action;
+    kernel_new_action.sa_flags = new_action->sa_flags;
+    kernel_new_action.sa_handler = new_action->sa_handler;
+    kernel_new_action.sa_mask = new_action->sa_mask;
+
+    __kernel_sigaction kernel_old_action;
+    int result = syscall(__NR_rt_sigaction, signal, &kernel_new_action,
+                         &kernel_old_action, sizeof(sigset_t));
+    old_action->sa_flags = kernel_old_action.sa_flags;
+    old_action->sa_handler = kernel_old_action.sa_handler;
+    old_action->sa_mask = kernel_old_action.sa_mask;
+
+    return result;
+}
+#else
+#define sigaction_wrapper sigaction
+#endif
+
 // The signal handlers which our handlers replaced, if any, for forwarding
 // signals for segfaults outside of our encrypted pages
 struct sigaction old_segv;
@@ -406,9 +432,9 @@ void install_handler()
         action.sa_sigaction = signal_handler;
         action.sa_flags = SA_SIGINFO;
 
-        if (sigaction(SIGSEGV, &action, &old_segv) != 0)
+        if (sigaction_wrapper(SIGSEGV, &action, &old_segv) != 0)
             REALM_TERMINATE("sigaction SEGV failed");
-        if (sigaction(SIGBUS, &action, &old_bus) != 0)
+        if (sigaction_wrapper(SIGBUS, &action, &old_bus) != 0)
             REALM_TERMINATE("sigaction SIGBUS");
     }
 }
diff --git a/test/test_encrypted_file_mapping.cpp b/test/test_encrypted_file_mapping.cpp
index 93eac74f3e5..b3cebf00722 100644
--- a/test/test_encrypted_file_mapping.cpp
+++ b/test/test_encrypted_file_mapping.cpp
@@ -6,6 +6,7 @@
 #include "test.hpp"
 
 #include <fcntl.h>
+#include <sys/stat.h>
 #include <unistd.h>
 
 // Test independence and thread-safety