diff --git a/include/polarssl/x509_csr.h b/include/polarssl/x509_csr.h
index 32befdb..5b4b1ba 100644
--- a/include/polarssl/x509_csr.h
+++ b/include/polarssl/x509_csr.h
@@ -118,6 +118,13 @@
                         const x509_csr *csr );
 
 /**
+ * \brief          Initialize a CSR
+ *
+ * \param csr      CSR to initialize
+ */
+void x509_csr_init( x509_csr *csr );
+
+/**
  * \brief          Unallocate all CSR data
  *
  * \param csr      CSR to free