diff --git a/libcc2rs/src/io.rs b/libcc2rs/src/io.rs
index a9f3ce49..32c11623 100644
--- a/libcc2rs/src/io.rs
+++ b/libcc2rs/src/io.rs
@@ -112,7 +112,7 @@ pub fn fread_refcount(a0: AnyPtr, a1: u64, a2: u64, a3: Ptr<::std::fs::File>) ->
 
         for &byte in &buffer[..n] {
             dst.write(byte);
-            dst = dst.offset(1);
+            dst += 1;
         }
 
         read_bytes += n;
diff --git a/libcc2rs/src/rc.rs b/libcc2rs/src/rc.rs
index 63f1942b..877e73fd 100644
--- a/libcc2rs/src/rc.rs
+++ b/libcc2rs/src/rc.rs
@@ -641,7 +641,7 @@ impl<T> Iterator for StringIterator<T> {
         // skip the null terminator
         if self.ptr.get_offset() + 1 < self.ptr.len() {
             let value = self.ptr.clone();
-            self.ptr = self.ptr.offset(1);
+            self.ptr += 1;
             Some(value)
         } else {
             None