diff --git a/src/drivers/St7789.h b/src/drivers/St7789.h
index 053caccb..a487a952 100644
--- a/src/drivers/St7789.h
+++ b/src/drivers/St7789.h
@@ -58,7 +58,7 @@ namespace Pinetime {
           ColumnAddressSet = 0x2a,
           RowAddressSet = 0x2b,
           WriteToRam = 0x2c,
-          MemoryDataAccessControl = 036,
+          MemoryDataAccessControl = 0x36,
           VerticalScrollDefinition = 0x33,
           VerticalScrollStartAddress = 0x37,
           ColMod = 0x3a,