diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6a0cd63a9..5096f2e72 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -29,7 +29,7 @@ file (STRINGS ${PROJECT_SOURCE_DIR}/VERSION DAMASK_VERSION)
 
 message ("\nBuilding ${CMAKE_PROJECT_NAME} ${DAMASK_VERSION}\n")
 
-add_definitions (-DPETSc)
+add_definitions (-DPETSC)
 add_definitions (-DDAMASKVERSION="${DAMASK_VERSION}")
 
 if (CMAKE_BUILD_TYPE STREQUAL "")
diff --git a/src/HDF5_utilities.f90 b/src/HDF5_utilities.f90
index ec8b16d49..afcdd0a64 100644
--- a/src/HDF5_utilities.f90
+++ b/src/HDF5_utilities.f90
@@ -6,8 +6,8 @@
 !--------------------------------------------------------------------------------------------------
 module HDF5_utilities
   use HDF5
-#ifdef PETSc
-  use PETSC
+#ifdef PETSC
+  use PETSc
 #endif
 
   use prec
@@ -71,7 +71,7 @@ module HDF5_utilities
     module procedure HDF5_addAttribute_real_array
   end interface HDF5_addAttribute
 
-#ifdef PETSc
+#ifdef PETSC
   logical, parameter, private :: parallel_default = .true.
 #else
   logical, parameter, private :: parallel_default = .false.
@@ -142,7 +142,7 @@ integer(HID_T) function HDF5_openFile(fileName,mode)
   call h5pcreate_f(H5P_FILE_ACCESS_F, plist_id, hdferr)
   if(hdferr < 0) error stop 'HDF5 error'
 
-#ifdef PETSc
+#ifdef PETSC
   call h5pset_fapl_mpio_f(plist_id, PETSC_COMM_WORLD, MPI_INFO_NULL, hdferr)
   if(hdferr < 0) error stop 'HDF5 error'
 #endif
@@ -199,7 +199,7 @@ integer(HID_T) function HDF5_addGroup(fileHandle,groupName)
 
 !-------------------------------------------------------------------------------------------------
 ! setting I/O mode to collective
-#ifdef PETSc
+#ifdef PETSC
   call h5pset_all_coll_metadata_ops_f(aplist_id, .true., hdferr)
   if(hdferr < 0) error stop 'HDF5 error'
 #endif
@@ -235,7 +235,7 @@ integer(HID_T) function HDF5_openGroup(fileHandle,groupName)
 
  !-------------------------------------------------------------------------------------------------
  ! setting I/O mode to collective
-#ifdef PETSc
+#ifdef PETSC
   call h5pget_all_coll_metadata_ops_f(aplist_id, is_collective, hdferr)
   if(hdferr < 0) error stop 'HDF5 error'
 #endif
@@ -1704,7 +1704,7 @@ subroutine initialize_read(dset_id, filespace_id, memspace_id, plist_id, aplist_
 !--------------------------------------------------------------------------------------------------
   readSize = 0
   readSize(worldrank+1) = int(localShape(ubound(localShape,1)))
-#ifdef PETSc
+#ifdef PETSC
   if (parallel) then
     call h5pset_dxpl_mpio_f(plist_id, H5FD_MPIO_COLLECTIVE_F, hdferr)
     if(hdferr < 0) error stop 'HDF5 error'
@@ -1725,7 +1725,7 @@ subroutine initialize_read(dset_id, filespace_id, memspace_id, plist_id, aplist_
 ! creating a property list for IO and set it to collective
   call h5pcreate_f(H5P_DATASET_ACCESS_F, aplist_id, hdferr)
   if(hdferr < 0) error stop 'HDF5 error'
-#ifdef PETSc
+#ifdef PETSC
   call h5pset_all_coll_metadata_ops_f(aplist_id, .true., hdferr)
   if(hdferr < 0) error stop 'HDF5 error'
 #endif
@@ -1794,7 +1794,7 @@ subroutine initialize_write(dset_id, filespace_id, memspace_id, plist_id, &
 ! creating a property list for transfer properties (is collective when reading in parallel)
   call h5pcreate_f(H5P_DATASET_XFER_F, plist_id, hdferr)
   if(hdferr < 0) error stop 'HDF5 error'
-#ifdef PETSc
+#ifdef PETSC
   if (parallel) then
     call h5pset_dxpl_mpio_f(plist_id, H5FD_MPIO_COLLECTIVE_F, hdferr)
     if(hdferr < 0) error stop 'HDF5 error'
@@ -1805,7 +1805,7 @@ subroutine initialize_write(dset_id, filespace_id, memspace_id, plist_id, &
 ! determine the global data layout among all processes
   writeSize              = 0
   writeSize(worldrank+1) = int(myShape(ubound(myShape,1)))
-#ifdef PETSc
+#ifdef PETSC
   if (parallel) then
     call MPI_allreduce(MPI_IN_PLACE,writeSize,worldsize,MPI_INT,MPI_SUM,PETSC_COMM_WORLD,ierr)      ! get total output size over each process
     if (ierr /= 0) error stop 'MPI error'
diff --git a/src/parallelization.f90 b/src/parallelization.f90
index ee8e71006..32ea16edc 100644
--- a/src/parallelization.f90
+++ b/src/parallelization.f90
@@ -6,7 +6,7 @@ module parallelization
   use, intrinsic :: ISO_fortran_env, only: &
     OUTPUT_UNIT
 
-#ifdef PETSc
+#ifdef PETSC
 #include <petsc/finclude/petscsys.h>
    use petscsys
 !$ use OMP_LIB
@@ -20,7 +20,7 @@ module parallelization
     worldrank = 0, &                                                                                !< MPI worldrank (/=0 for MPI simulations only)
     worldsize = 1                                                                                   !< MPI worldsize (/=1 for MPI simulations only)
 
-#ifdef PETSc
+#ifdef PETSC
   public :: &
     parallelization_init
 
diff --git a/src/results.f90 b/src/results.f90
index f348b7d9d..5cf93661b 100644
--- a/src/results.f90
+++ b/src/results.f90
@@ -11,8 +11,8 @@ module results
   use IO
   use HDF5_utilities
   use HDF5
-#ifdef PETSc
-  use PETSC
+#ifdef PETSC
+  use PETSc
 #endif
 
   implicit none