diff --git a/Makefile.Defines b/Makefile.Defines
index 5ad6e242a..31575ab00 100644
--- a/Makefile.Defines
+++ b/Makefile.Defines
@@ -54,7 +54,7 @@ VTUNE_FLAGS = -g -O2 -vec -simd -shared-intel -qopenmp -debug inline-debug-info
 IDEBUG = -O0 -warn all -nogen-interfaces -no-pie -no-ftz -fpe-all=0 -g -traceback -mp1 -fp-model strict -fpe0 -debug all -align all -pad -ip -prec-div -prec-sqrt -assume protect-parens -CB -no-wrap-margin 
 
 STRICTREAL = -mp1 -fp-model strict -prec-div -prec-sqrt -ftz -assume protect-parens 
-SIMDVEC = -vec -simd -xhost -fma -align all -assume contiguous_assumed_shape -vecabi=cmdtarget
+SIMDVEC = -vec -simd -xhost -fma -align all -assume contiguous_assumed_shape -vecabi=cmdtarget -qopt-zmm-usage=high
 PAR = -parallel -qopenmp 
 HEAPARR = -heap-arrays 1048576 
 OPTIMIZE = -qopt-report=5