diff --git a/src/Makefile b/src/Makefile
index 9b7cc0892a..7de59c267d 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -77,10 +77,9 @@ ifeq ($(COMPILER),gfortran)
 endif
 
 # use petsc compiler
-
 ifeq ($(COMPILER),petsc)
   F90 = ${FLINKER}
-  F90FLAGS := -cpp -ffree-form
+  F90FLAGS := -cpp -ffree-form -I ${PETSC_DIR}/include
   include ${PETSC_DIR}/conf/variables
   include ${PETSC_DIR}/conf/rules
   LDFLAGS = ${PETSC_SYS_LIB}
diff --git a/src/cmfd_header.f90 b/src/cmfd_header.F90
similarity index 100%
rename from src/cmfd_header.f90
rename to src/cmfd_header.F90
diff --git a/src/cmfd_utils.f90 b/src/cmfd_utils.F90
similarity index 100%
rename from src/cmfd_utils.f90
rename to src/cmfd_utils.F90
diff --git a/src/source.F90 b/src/source.F90
index b3b9a552f1..aa326be32a 100644
--- a/src/source.F90
+++ b/src/source.F90
@@ -45,11 +45,11 @@ contains
     ! Allocate source bank
     allocate(source_bank(maxwork), STAT=alloc_err)
     if (alloc_err /= 0) then
-#ifndef NO_F2008
-       bytes = maxwork * storage_size(bank_obj) / 8
-#else
+!#ifndef NO_F2008
+!      bytes = maxwork * storage_size(bank_obj) / 8
+!#else
        bytes = maxwork * 64 / 8
-#endif
+!#endif
        message = "Could not allocate source bank. Attempted to allocate " &
             // trim(int_to_str(bytes)) // " bytes."
        call fatal_error()
@@ -58,11 +58,11 @@ contains
     ! Allocate fission bank
     allocate(fission_bank(3*maxwork), STAT=alloc_err)
     if (alloc_err /= 0) then
-#ifndef NO_F2008
-       bytes = 3 * maxwork * storage_size(bank_obj) / 8
-#else
+!#ifndef NO_F2008
+!      bytes = 3 * maxwork * storage_size(bank_obj) / 8
+!#else
        bytes = 3 * maxwork * 64 / 8
-#endif
+!#endif
        message = "Could not allocate fission bank. Attempted to allocate " &
             // trim(int_to_str(bytes)) // " bytes."
        call fatal_error()