diff --git a/.travis.yml b/.travis.yml
index 042fa30..4cfc268 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,7 +4,7 @@ jobs:
   include:
   - rust: stable
     os: linux
-  - rust: 1.33.0
+  - rust: 1.34.0
     os: linux
   - rust: stable
     os: osx
diff --git a/aeron-rs/src/cnc_descriptor.rs b/aeron-rs/src/cnc_descriptor.rs
index 400bdf0..102e021 100644
--- a/aeron-rs/src/cnc_descriptor.rs
+++ b/aeron-rs/src/cnc_descriptor.rs
@@ -103,7 +103,7 @@ mod tests {
                 .expect("Unable to memory map CnC file")
         };
 
-        let metadata: &MetaDataDefinition = unsafe { &*(mmap.as_ptr().cast()) };
+        let metadata: &MetaDataDefinition = unsafe { &*(mmap.as_ptr() as *const MetaDataDefinition) };
         assert_eq!(metadata.cnc_version, CNC_VERSION);
     }
 }