diff --git a/param.h b/param.h
index 634e0ef5d..5250b2f39 100644
--- a/param.h
+++ b/param.h
@@ -2955,7 +2955,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #define GEMM_DEFAULT_OFFSET_A 0
 #define GEMM_DEFAULT_OFFSET_B 0
-#define GEMM_DEFAULT_ALIGN 0x03fffUL
+#define GEMM_DEFAULT_ALIGN (BLASULONG)0x03fffUL
 
 #define SYMV_P	16