diff --git a/param.h b/param.h
index 8e598d8a01..9d7211b858 100644
--- a/param.h
+++ b/param.h
@@ -1780,7 +1780,7 @@ 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 (BLASLONG)0x03fffUL
 
 #define SYMV_P  8
 
@@ -1913,7 +1913,7 @@ 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 (BLASLONG)0x03fffUL
 
 #define SYMV_P  8