diff --git a/lib/toolchain.py b/lib/toolchain.py
index 701ace1..35558a8 100644
--- a/lib/toolchain.py
+++ b/lib/toolchain.py
@@ -53,9 +53,9 @@ def set_toolchain(compiler, mpi):
             cxx = "mpicxx"
             fc = "mpif90"
         elif mpi == "necmpi":
-            cc = "\"mpincc -vh\""
-            cxx = "\"mpinc++ -vh\""
-            fc = "\"mpinfort -vh\""
+            cc = "mpincc -vh"
+            cxx = "mpinc++ -vh"
+            fc = "mpinfort -vh"
             os.environ["NMPI_CC_H"] = "gcc"
             os.environ["NMPI_CXX_H"] = "g++"
             os.environ["NMPI_FC_H"] = "gfortran"
@@ -70,13 +70,13 @@ def set_toolchain(compiler, mpi):
             os.environ["OMPI_MPIF90"] = "flang"
             os.environ["OMPI_MPIF77"] = "flang"
         elif (mpi == "intelmpi"):
-            cc = "\"mpicc -cc=clang\""
-            cxx = "\"mpicxx -cxx=clang++\""
-            fc = "\"mpif90 -fc=flang\""
+            cc = "mpicc -cc=clang"
+            cxx = "mpicxx -cxx=clang++"
+            fc = "mpif90 -fc=flang"
         elif mpi == "necmpi":
-            cc = "\"mpincc -vh\""
+            cc = "mpincc -vh"
             cxx = "mpic++ -vh"
-            fc = "\"mpinfort -vh\""
+            fc = "mpinfort -vh"
             os.environ["NMPI_CC_H"] = "clang"
             os.environ["NMPI_CXX_H"] = "clang++"
             os.environ["NMPI_FC_H"] = "flang"
@@ -95,9 +95,9 @@ def set_toolchain(compiler, mpi):
             cxx = "mpiicpc"
             fc = "mpiifort"
         elif mpi == "necmpi":
-            cc = "\"mpincc -vh\""
+            cc = "mpincc -vh"
             cxx = "mpic++ -vh"
-            fc = "\"mpinfort -vh\""
+            fc = "mpinfort -vh"
             os.environ["NMPI_CC_H"] = "icc"
             os.environ["NMPI_CXX_H"] = "icpc"
             os.environ["NMPI_FC_H"] = "ifort"