diff --git a/CMakeLists.txt b/CMakeLists.txt
index 22eb2291458f9a31aeeacf8379a978fc614ea04c..6f3c000ff260e019cf821927f15dd3f595b58c0b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,7 +43,7 @@ if (vkcv_build_debug)
 endif()
 
 if ((CMAKE_CXX_COMPILER_ID STREQUAL "GNU") AND (CMAKE_CXX_COMPILER_VERSION VERSION_LESS "10.0.0"))
-	set(vkcv_flags ${vkcv_flags} " -std=c++2a")
+	set(vkcv_flags ${vkcv_flags} " -std=c++2a -std=gnu++2a")
 endif()
 
 # configure everything to use the required dependencies