diff --git a/cmake/run_mkimage.cmake b/cmake/run_mkimage.cmake
index a0ac4ec..821de76 100644
--- a/cmake/run_mkimage.cmake
+++ b/cmake/run_mkimage.cmake
@@ -1,6 +1,9 @@
 file(READ ${VERSION_HEADER} V)
-string(REGEX MATCH "\"([^\"]*)\"" _m "${V}")
+string(REGEX MATCH "NINLIGHT_FW_VERSION[ \t]+\"([^\"]*)\"" _m "${V}")
 set(VERSION "${CMAKE_MATCH_1}")
+if(NOT VERSION)
+  message(FATAL_ERROR "run_mkimage: NINLIGHT_FW_VERSION not found in ${VERSION_HEADER}")
+endif()
 execute_process(COMMAND python3 ${MKIMAGE} --image ${IMAGE} --device ${DEVICE} --version ${VERSION} --out ${OUT}
                 RESULT_VARIABLE rc)
 if(NOT rc EQUAL 0)