diff --git a/Makefile.system b/Makefile.system
index b63c7799d..7ba45f2e1 100644
--- a/Makefile.system
+++ b/Makefile.system
@@ -872,8 +872,14 @@ override FPFLAGS    += $(COMMON_OPT) $(FCOMMON_OPT) $(COMMON_PROF)
 #MAKEOVERRIDES =
 
 #For LAPACK Fortran codes.
+#Disable -fopenmp for LAPACK Fortran codes on Windows.
+ifdef OS_WINDOWS
 LAPACK_FFLAGS := $(filter-out -fopenmp -mp -openmp -xopenmp=parallel,$(FFLAGS))
 LAPACK_FPFLAGS := $(filter-out -fopenmp -mp -openmp -xopenmp=parallel,$(FPFLAGS))
+else
+LAPACK_FFLAGS := $(FFLAGS)
+LAPACK_FPFLAGS := $(FPFLAGS)
+endif
 
 LAPACK_CFLAGS = $(CFLAGS)
 LAPACK_CFLAGS += -DHAVE_LAPACK_CONFIG_H