diff --git a/src/include/spi.h b/src/include/spi.h
index 7d195d0..5fbe51e 100644
--- a/src/include/spi.h
+++ b/src/include/spi.h
@@ -46,6 +46,7 @@
 
 /* SPI opcodes */
 #define SPI_OPCODE_WREN 0x06
+#define SPI_OPCODE_FAST_READ 0x0b
 
 /*-----------------------------------------------------------------------
  * Representation of a SPI slave, i.e. what we're communicating with.