diff --git a/CMakeLists.txt b/CMakeLists.txt
index 08027ce..99e42e1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -91,7 +91,6 @@ option(enable_complex16 "Enable complex16 precision library" ON)
 ## add_definitions(-DPRNTlevel=0 -DAdd_)
 ## get_directory_property( DirDefs COMPILE_DEFINITIONS )
 set(CMAKE_C_FLAGS "-DPRNTlevel=0 -DDEBUGlevel=0 ${CMAKE_C_FLAGS}")
-set(CMAKE_C_FLAGS_RELEASE "-O3" CACHE STRING "")
 
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 #