diff --git a/OpenVPN Adapter/OpenVPNCertificate.m b/OpenVPN Adapter/OpenVPNCertificate.m
index c1f32ef..8789417 100644
--- a/OpenVPN Adapter/OpenVPNCertificate.m	
+++ b/OpenVPN Adapter/OpenVPNCertificate.m	
@@ -93,7 +93,7 @@
         return nil;
     }
     
-    return [NSData dataWithBytes:pem_buffer length:output_length];
+    return [NSData dataWithBytes:pem_buffer length:output_length - 1];
 }
 
 - (NSData *)derData:(out NSError **)error {