Fix proprocessor directives for MBEDTLS_RIPEMD160_ALT
diff --git a/include/mbedtls/ripemd160.h b/include/mbedtls/ripemd160.h
index 93a16bc..3921e66 100644
--- a/include/mbedtls/ripemd160.h
+++ b/include/mbedtls/ripemd160.h
@@ -199,7 +199,7 @@
 #endif
 
 #else  /* MBEDTLS_RIPEMD160_ALT */
-#include "ripemd160.h"
+#include "ripemd160_alt.h"
 #endif /* MBEDTLS_RIPEMD160_ALT */
 
 #ifdef __cplusplus