diff --git a/cblas.h b/cblas.h
index 57e38266a..9f023b5ab 100644
--- a/cblas.h
+++ b/cblas.h
@@ -51,9 +51,9 @@ int openblas_get_parallel(void);
 
 #define CBLAS_INDEX size_t
 
-typedef enum CBLAS_ORDER     {CblasRowMajor=101, CblasColMajor=102} CBLAS_ORDER;
+typedef enum CBLAS_ORDER     {CblasRowMajor=101, CblasColMajor=102, uNDEF=-1} CBLAS_ORDER;
 typedef enum CBLAS_TRANSPOSE {CblasNoTrans=111, CblasTrans=112, CblasConjTrans=113, CblasConjNoTrans=114, UNDEFINED=-1} CBLAS_TRANSPOSE;
-typedef enum CBLAS_UPLO      {CblasUpper=121, CblasLower=122} CBLAS_UPLO;
+typedef enum CBLAS_UPLO      {CblasUpper=121, CblasLower=122, UNDEF=-1} CBLAS_UPLO;
 typedef enum CBLAS_DIAG      {CblasNonUnit=131, CblasUnit=132} CBLAS_DIAG;
 typedef enum CBLAS_SIDE      {CblasLeft=141, CblasRight=142} CBLAS_SIDE;
 typedef CBLAS_ORDER CBLAS_LAYOUT;