diff --git a/easybuild/easyconfigs/e/ELSI/ELSI-2.6.4-foss-2020b-PEXSI.eb b/easybuild/easyconfigs/e/ELSI/ELSI-2.6.4-foss-2020b-PEXSI.eb
index 332df2352b0..c901d2a7f49 100644
--- a/easybuild/easyconfigs/e/ELSI/ELSI-2.6.4-foss-2020b-PEXSI.eb
+++ b/easybuild/easyconfigs/e/ELSI/ELSI-2.6.4-foss-2020b-PEXSI.eb
@@ -37,7 +37,8 @@ dependencies = [
 
 build_internal_pexsi = True
 
-configopts = '-DENABLE_BSEPACK=ON -DCMAKE_Fortran_FLAGS="-fallow-argument-mismatch $FFLAGS" '
+configopts = '-DENABLE_BSEPACK=ON -DCMAKE_C_COMPILER="$CC" -DCMAKE_CXX_COMPILER="$CXX" -DCMAKE_Fortran_COMPILER="$F90" '
+configopts += '-DCMAKE_Fortran_FLAGS="-fallow-argument-mismatch $FFLAGS" '
 
 runtest = True
 
diff --git a/easybuild/easyconfigs/e/ELSI/ELSI-2.6.4-intel-2020b-PEXSI.eb b/easybuild/easyconfigs/e/ELSI/ELSI-2.6.4-intel-2020b-PEXSI.eb
index 800d33b16dc..6536f7b5ad4 100644
--- a/easybuild/easyconfigs/e/ELSI/ELSI-2.6.4-intel-2020b-PEXSI.eb
+++ b/easybuild/easyconfigs/e/ELSI/ELSI-2.6.4-intel-2020b-PEXSI.eb
@@ -37,7 +37,7 @@ dependencies = [
 
 build_internal_pexsi = True
 
-configopts = "-DENABLE_BSEPACK=ON"
+configopts = '-DENABLE_BSEPACK=ON -DCMAKE_C_COMPILER="$CC" -DCMAKE_CXX_COMPILER="$CXX" -DCMAKE_Fortran_COMPILER="$F90" '
 
 runtest = True