diff --git a/firmware/hackrf-common.cmake b/firmware/hackrf-common.cmake
index 402e9c6c..add10b23 100644
--- a/firmware/hackrf-common.cmake
+++ b/firmware/hackrf-common.cmake
@@ -98,7 +98,11 @@ SET(CPUFLAGS_M4 "-mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16")
 SET(CFLAGS_M4 "-std=gnu99 ${CFLAGS_COMMON} ${CPUFLAGS_M4} -DLPC43XX_M4")
 SET(CXXFLAGS_M4 "-std=gnu++0x ${CFLAGS_COMMON} ${CPUFLAGS_M4} -DLPC43XX_M4")
 SET(LDFLAGS_M4 "${LDFLAGS_COMMON} ${CPUFLAGS_M4} ${LDSCRIPT_M4} -Xlinker -Map=m4.map")
-SET(CFLAGS_M4_DFU "-std=gnu99 ${CFLAGS_COMMON} ${CPUFLAGS_M4} -DLPC43XX_M4 -DDFU_MODE")
+
+SET(CFLAGS_M4_DFU "-std=gnu99 ${CFLAGS_COMMON} ${CPUFLAGS_M4} -DLPC43XX_M4")
+if(NOT USER_INTERFACE STREQUAL "PORTAPACK")
+	SET(CFLAGS_M4_DFU "${CFLAGS_M4_DFU} -DDFU_MODE")
+endif()
 SET(LDFLAGS_M4_DFU "${LDFLAGS_COMMON} ${CPUFLAGS_M4} ${LDSCRIPT_M4_DFU} -Xlinker -Map=m4.map")
 
 set(BUILD_SHARED_LIBS OFF)