diff --git a/aarch64-symbol-imports.txt b/aarch64-symbol-imports.txt
new file mode 100644
index 0000000..4b54ba1
--- /dev/null
+++ b/aarch64-symbol-imports.txt
@@ -0,0 +1,3 @@
+free@GLIBC_2.17
+malloc@GLIBC_2.17
+memmove@GLIBC_2.17
diff --git a/src/parser3.h b/src/parser3.h
index 4f7e9d8..6a233eb 100644
--- a/src/parser3.h
+++ b/src/parser3.h
@@ -218,7 +218,7 @@ inline PRESERVE_NONE WeaselJsonStatus scan_string_impl(Parser3 *self,
               .count_leading_nonzero_lanes();
       buf += normal;
       if (normal < V::lanes) {
-        if (buf != bufEnd && *buf < 0x20) {
+        if (buf != bufEnd && (int8_t)*buf < 0x20) {
           buf = (char *)self->strDfa.scan(buf, bufEnd);
         }
         break;