diff --git a/src/cache.rs b/src/cache.rs
index 4e6b945..6de1b46 100644
--- a/src/cache.rs
+++ b/src/cache.rs
@@ -153,7 +153,7 @@ impl StatementCache {
     }
 
     // Return a statement to the cache.
-    fn cache_stmt(&self, stmt: RawStatement) {
+    fn cache_stmt(&self, mut stmt: RawStatement) {
         if stmt.is_null() {
             return;
         }
diff --git a/src/raw_statement.rs b/src/raw_statement.rs
index 1683c7b..40715a2 100644
--- a/src/raw_statement.rs
+++ b/src/raw_statement.rs
@@ -169,7 +169,7 @@ impl RawStatement {
     }
 
     #[inline]
-    pub fn clear_bindings(&self) {
+    pub fn clear_bindings(&mut self) {
         unsafe {
             ffi::sqlite3_clear_bindings(self.ptr);
         } // rc is always SQLITE_OK