diff --git a/CMakeLists.txt b/CMakeLists.txt
index 10496cfa..8b8eea0e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -35,7 +35,7 @@ if (MSVC)
 	set(CMAKE_EXE_LINKER_FLAGS_RELEASE "/DEBUG /MANIFEST:NO /INCREMENTAL:NO /OPT:REF,ICF" CACHE STRING "" FORCE)
 else()
 	# set(CMAKE_C_FLAGS "-Wall -Wextra -pedantic -Wconversion -std=gnu99")
-	set(CMAKE_C_FLAGS "-Wall -Wextra -Wno-missing-field-initializers -Wdouble-promotion -std=gnu99 -D_GNU_SOURCE")
+	set(CMAKE_C_FLAGS "-Wall -Wextra -Wno-missing-field-initializers -std=c99 -D_GNU_SOURCE")
 	set(CMAKE_C_FLAGS_RELEASE "-O2 -ftree-vectorize -g")
 	set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -O0 -g")
 	if (ASAN)