diff --git a/CMakeLists.txt b/CMakeLists.txt
index cae27c3b..adc99e8c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,9 +31,9 @@ if (CMAKE_C_COMPILER_ID MATCHES "Clang")
   set(CMAKE_C_FLAGS_RELWITHDEBINFO "-O2 -ggdb")
   add_compile_options(-Werror -Wall -Wno-unused-parameter -Wno-unused-function -Wno-missing-braces -Qunused-arguments -Wno-deprecated-declarations)
 elseif(CMAKE_C_COMPILER_ID MATCHES "GNU")
-  set(CMAKE_C_FLAGS_RELEASE -O2)
+  set(CMAKE_C_FLAGS_RELEASE "-O2 -fpeel-loops")
   set(CMAKE_C_FLAGS_DEBUG "-O0 -ggdb")
-  set(CMAKE_C_FLAGS_RELWITHDEBINFO "-O2 -ggdb")
+  set(CMAKE_C_FLAGS_RELWITHDEBINFO "-O2 -fpeel-loops -ggdb")
   add_compile_options(-Werror -Wall -Wno-unused-parameter -Wno-unused-function -Wno-missing-braces -Wno-error=unknown-pragmas -Wno-error=pragmas -Wno-deprecated-declarations)
 elseif(CMAKE_C_COMPILER_ID MATCHES "MSVC")
   add_definitions(-D_CRT_SECURE_NO_WARNINGS)