diff --git a/CMakeLists.txt b/CMakeLists.txt
index e3ae3b7ff..cbddde251 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -128,6 +128,10 @@ set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${PROC_FLAGS}")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror=unused-label")
 set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror=delete-incomplete")
 
+# Do net set math errno, as we never check its value.
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fno-math-errno")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fno-math-errno")
+
 # Special treatment for x87 and x86-32 SSE (see GitHub issue #4324)
 include(FindX87Math)
 if(HAVE_X87_MATH)