diff --git a/capi/src/symbolize.rs b/capi/src/symbolize.rs
index 3e954a21..29cbfc9e 100644
--- a/capi/src/symbolize.rs
+++ b/capi/src/symbolize.rs
@@ -69,7 +69,7 @@ pub struct blaze_cache_src_process {
     pub cache_vmas: bool,
     /// Unused member available for future expansion. Must be initialized
     /// to zero.
-    pub reserved: [u8; 15],
+    pub reserved: [u8; 11],
 }
 
 impl Default for blaze_cache_src_process {
@@ -78,7 +78,7 @@ impl Default for blaze_cache_src_process {
             type_size: mem::size_of::<Self>(),
             pid: 0,
             cache_vmas: false,
-            reserved: [0; 15],
+            reserved: [0; 11],
         }
     }
 }
@@ -1437,6 +1437,20 @@ mod tests {
         );
     }
 
+    /// Check that we can convert a [`blaze_cache_src_process`] into a
+    /// [`cache::Process`].
+    #[tag(miri)]
+    #[test]
+    fn cache_process_conversion() {
+        let process = blaze_cache_src_process {
+            pid: 42,
+            cache_vmas: false,
+            ..Default::default()
+        };
+        let process = cache::Process::from(process);
+        assert_eq!(process.pid, Pid::from(42))
+    }
+
     /// Test the Rust to C symbol conversion.
     #[tag(miri)]
     #[test]
@@ -1933,6 +1947,7 @@ mod tests {
             ..Default::default()
         };
         let () = unsafe { blaze_symbolize_cache_process(symbolizer, &cache) };
+        assert_eq!(blaze_err_last(), blaze_err::BLAZE_ERR_OK);
 
         let src = blaze_symbolize_src_process {
             pid: 0,