diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0b0afa4af..e32d5c5a4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -530,7 +530,7 @@ endif()
 ##############################################################################
 
 # Compiler flags.
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -fmax-errors=10 -std=c++11 -O2 -ffast-math -ftree-vectorize ${EXTRA_FLAGS}")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -fmax-errors=10 -ffast-math -ftree-vectorize ${EXTRA_FLAGS}")
 
 set(sdrangel_SOURCES
     app/main.cpp