diff --git a/CMakeLists.txt b/CMakeLists.txt
index 623b0d38a..c79cc998e 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,8 +27,8 @@ project(weechat C)
 set(CMAKE_VERBOSE_MAKEFILE OFF)
 set(CMAKE_MODULE_PATH ${CMAKE_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH})
 set(CMAKE_SKIP_RPATH ON)
-set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -fsigned-char -Wall -Wextra -Werror-implicit-function-declaration -Wformat-overflow=2 -Wformat-truncation=2")
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsigned-char -Wall -Wextra -Wformat-overflow=2 -Wformat-truncation=2")
+set(CMAKE_C_FLAGS   "${CMAKE_C_FLAGS} -fsigned-char -Wall -Wextra -Werror-implicit-function-declaration")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fsigned-char -Wall -Wextra")
 
 # version
 execute_process(COMMAND ${CMAKE_SOURCE_DIR}/version.sh devel-major OUTPUT_VARIABLE VERSION_MAJOR)
diff --git a/configure.ac b/configure.ac
index 7ef5ad5a5..6e707c4dc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1282,8 +1282,8 @@ AC_DEFINE_UNQUOTED(WEECHAT_SHAREDIR, "$WEECHAT_SHAREDIR")
 weechat_libdir=${libdir}/weechat
 AC_SUBST(weechat_libdir)
 
-COMMON_CFLAGS="-fsigned-char -Wall -Wextra -Werror-implicit-function-declaration -Wformat-overflow=2 -Wformat-truncation=2"
-COMMON_CXXFLAGS="-fsigned-char -Wall -Wextra -Wformat-overflow=2 -Wformat-truncation=2"
+COMMON_CFLAGS="-fsigned-char -Wall -Wextra -Werror-implicit-function-declaration"
+COMMON_CXXFLAGS="-fsigned-char -Wall -Wextra"
 
 AC_MSG_CHECKING([whether we have GNU assembler])
 GAS=`as --version < /dev/null 2>/dev/null | grep GNU`