diff --git a/src/main/java/org/lmdbjava/Env.java b/src/main/java/org/lmdbjava/Env.java
index 0a4c034..db8b0f4 100644
--- a/src/main/java/org/lmdbjava/Env.java
+++ b/src/main/java/org/lmdbjava/Env.java
@@ -41,6 +41,7 @@
 import java.util.List;
 
 import jnr.ffi.Pointer;
+import jnr.ffi.byref.IntByReference;
 import jnr.ffi.byref.PointerByReference;
 import org.lmdbjava.Library.MDB_envinfo;
 import org.lmdbjava.Library.MDB_stat;
@@ -500,6 +501,15 @@ private void validatePath(final File path) {
     validateDirectoryEmpty(path);
   }
 
+  
+  /* Check for stale entries in the reader lock table. */
+  public int readerCheck() {
+    final IntByReference resultPtr = new IntByReference();
+    checkRc(LIB.mdb_reader_check(ptr, resultPtr));
+    return resultPtr.intValue();
+  }
+  
+  
   /**
    * Object has already been closed and the operation is therefore prohibited.
    */
@@ -530,6 +540,7 @@ public AlreadyOpenException() {
     }
   }
 
+ 
   /**
    * Builder for configuring and opening Env.
    *
@@ -595,6 +606,7 @@ public Env<T> open(final File path, final EnvFlags... flags) {
       return open(path, 0664, flags);
     }
 
+
     /**
      * Sets the map size.
      *
diff --git a/src/main/java/org/lmdbjava/Library.java b/src/main/java/org/lmdbjava/Library.java
index 44b1749..e48def7 100644
--- a/src/main/java/org/lmdbjava/Library.java
+++ b/src/main/java/org/lmdbjava/Library.java
@@ -291,7 +291,7 @@ int mdb_put(@In Pointer txn, @In Pointer dbi, @In Pointer key,
                 @In Pointer data,
                 int flags);
 
-    int mdb_reader_check(@In Pointer env, int dead);
+    int mdb_reader_check(@In Pointer env, @Out IntByReference dead);
 
     int mdb_set_compare(@In Pointer txn, @In Pointer dbi, ComparatorCallback cb);