diff --git a/External/SPEC/CINT2017rate/502.gcc_r/CMakeLists.txt b/External/SPEC/CINT2017rate/502.gcc_r/CMakeLists.txt
--- a/External/SPEC/CINT2017rate/502.gcc_r/CMakeLists.txt
+++ b/External/SPEC/CINT2017rate/502.gcc_r/CMakeLists.txt
@@ -8,7 +8,7 @@
 
 add_definitions(-DSPEC_502 -DIN_GCC -DHAVE_CONFIG_H)
 speccpu2017_add_include_dirs(. include spec_qsort)
-add_compile_options(-fgnu89-inline)
+add_compile_options(-fgnu89-inline -fno-strict-aliasing)
 
 ## test ########################################################################
 
diff --git a/External/SPEC/CINT2017rate/505.mcf_r/CMakeLists.txt b/External/SPEC/CINT2017rate/505.mcf_r/CMakeLists.txt
--- a/External/SPEC/CINT2017rate/505.mcf_r/CMakeLists.txt
+++ b/External/SPEC/CINT2017rate/505.mcf_r/CMakeLists.txt
@@ -7,6 +7,7 @@
 speccpu2017_benchmark(RATE)
 
 speccpu2017_add_include_dirs(spec_qsort)
+add_compile_options(-fno-strict-aliasing)
 
 ## test ########################################################################