diff --git a/openssl/src/asn1.rs b/openssl/src/asn1.rs
index d0704693..78c66d4b 100644
--- a/openssl/src/asn1.rs
+++ b/openssl/src/asn1.rs
@@ -54,7 +54,7 @@ impl Ref<Asn1String> {
     }
 
     pub fn as_slice(&self) -> &[u8] {
-        unsafe { slice::from_raw_parts(ffi::ASN1_STRING_data(self.as_ptr()), self.len()) }
+        unsafe { slice::from_raw_parts(ASN1_STRING_data(self.as_ptr()), self.len()) }
     }
 
     pub fn len(&self) -> usize {
@@ -63,3 +63,12 @@ impl Ref<Asn1String> {
         }
     }
 }
+
+#[cfg(any(ossl101, ossl102))]
+use ffi::ASN1_STRING_data;
+
+#[cfg(ossl110)]
+#[allow(bad_style)]
+unsafe fn ASN1_STRING_data(s: *mut ffi::ASN1_STRING) -> *mut ::libc::c_uchar {
+    ffi::ASN1_STRING_get0_data(s) as *mut _
+}