diff --git a/include/mbedtls/poly1305.h b/include/mbedtls/poly1305.h
index 54b50ab..c490cdf 100644
--- a/include/mbedtls/poly1305.h
+++ b/include/mbedtls/poly1305.h
@@ -52,7 +52,7 @@
 
 #if !defined(MBEDTLS_POLY1305_ALT)
 
-typedef struct
+typedef struct mbedtls_poly1305_context
 {
     uint32_t r[4];      /** The value for 'r' (low 128 bits of the key). */
     uint32_t s[4];      /** The value for 's' (high 128 bits of the key). */