diff --git a/library/common.h b/library/common.h
index c3847cd..e502b5d 100644
--- a/library/common.h
+++ b/library/common.h
@@ -414,7 +414,7 @@
  * \param   b Pointer to input (buffer of at least \p n bytes)
  * \param   n Number of bytes to process.
  */
-static inline void mbedtls_xor( unsigned char *r, unsigned char const *a, unsigned char const *b, size_t n )
+inline void mbedtls_xor( unsigned char *r, unsigned char const *a, unsigned char const *b, size_t n )
 {
 #if defined(MBEDTLS_ALLOW_UNALIGNED_ACCESS)
     uint32_t *a32 = (uint32_t *)a;