diff --git a/desktop_version/CMakeLists.txt b/desktop_version/CMakeLists.txt
index ebc72bb9c4..bdf7b7a3c7 100644
--- a/desktop_version/CMakeLists.txt
+++ b/desktop_version/CMakeLists.txt
@@ -318,6 +318,9 @@ else()
     # Disable RTTI
     string(REPLACE "-frtti" "" CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
     set_source_files_properties(${VVV_CXX_SRC} PROPERTIES COMPILE_FLAGS -fno-rtti)
+
+    # Dependencies (as needed)
+    set_source_files_properties(${CHM_SRC} PROPERTIES COMPILE_FLAGS -std=c99)
 endif()
 
 # Unfortunately, it doesn't seem like distros package LodePNG