diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9884cf179..d3473be1b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -232,7 +232,8 @@ if(GAMMARAY_STATIC_PROBE)
     set(GAMMARAY_PROBE_ONLY_BUILD_DEFAULT ON)
 endif()
 gammaray_option(
-    GAMMARAY_PROBE_ONLY_BUILD "Build only an additional probe configuration for an already existing launcher." ${GAMMARAY_PROBE_ONLY_BUILD_DEFAULT}
+    GAMMARAY_PROBE_ONLY_BUILD "Build only an additional probe configuration for an already existing launcher."
+    ${GAMMARAY_PROBE_ONLY_BUILD_DEFAULT}
 )
 if(GAMMARAY_STATIC_PROBE AND NOT GAMMARAY_PROBE_ONLY_BUILD)
     message(FATAL_ERROR "Must use PROBE_ONLY_BUILD for STATIC_PROBE.")