diff --git a/src/MAKE/OPTIONS/Makefile.intel_cpu b/src/MAKE/OPTIONS/Makefile.intel_cpu
index b34ff47761192433e3adc74007620e3c6ba4f6cf..b7db0645740a1fa62db80bc4e3637500af7f9fce 100755
--- a/src/MAKE/OPTIONS/Makefile.intel_cpu
+++ b/src/MAKE/OPTIONS/Makefile.intel_cpu
@@ -54,7 +54,7 @@ MPI_LIB =
 
 FFT_INC =       -DFFT_MKL -DFFT_SINGLE
 FFT_PATH = 
-FFT_LIB =       -L$MKLROOT/lib/intel64/ -lmkl_intel_ilp64 \
+FFT_LIB =       -L$(MKLROOT)/lib/intel64/ -lmkl_intel_ilp64 \
                 -lmkl_sequential -lmkl_core	
 
 # JPEG and/or PNG library
diff --git a/src/MAKE/OPTIONS/Makefile.intel_cpu_intelmpi b/src/MAKE/OPTIONS/Makefile.intel_cpu_intelmpi
index 74ff65d0c3ef9ce309e1591d947ed63d02c7b2ff..2cb37ed9fed4d36207ac86052a26f6d1b9cea4c1 100644
--- a/src/MAKE/OPTIONS/Makefile.intel_cpu_intelmpi
+++ b/src/MAKE/OPTIONS/Makefile.intel_cpu_intelmpi
@@ -54,7 +54,7 @@ MPI_LIB =
 
 FFT_INC =       -DFFT_MKL -DFFT_SINGLE
 FFT_PATH = 
-FFT_LIB =       -L$MKLROOT/lib/intel64/ -lmkl_intel_ilp64 \
+FFT_LIB =       -L$(MKLROOT)/lib/intel64/ -lmkl_intel_ilp64 \
                 -lmkl_sequential -lmkl_core	
 
 # JPEG and/or PNG library
diff --git a/src/MAKE/OPTIONS/Makefile.knl b/src/MAKE/OPTIONS/Makefile.knl
index 1260a27a124c57eaf1eb4561270293e9501b32e1..3bc777592e0164b4d5df1cd6eb0e95bca210d705 100644
--- a/src/MAKE/OPTIONS/Makefile.knl
+++ b/src/MAKE/OPTIONS/Makefile.knl
@@ -54,7 +54,7 @@ MPI_LIB =
 
 FFT_INC =       -DFFT_MKL -DFFT_SINGLE
 FFT_PATH = 
-FFT_LIB =       -L$MKLROOT/lib/intel64/ -lmkl_intel_ilp64 \
+FFT_LIB =       -L$(MKLROOT)/lib/intel64/ -lmkl_intel_ilp64 \
                 -lmkl_sequential -lmkl_core	
 
 # JPEG and/or PNG library