diff --git a/modules/int64.cmake b/modules/int64.cmake
index 944ea3b..45f4b23 100644
--- a/modules/int64.cmake
+++ b/modules/int64.cmake
@@ -9,7 +9,7 @@
 # autocmake.cfg configuration::
 #
 #   docopt: --int64 Enable 64bit integers [default: False].
-#   define: '-DENABLE_64BIT_INTEGERS=%s' % arguments['--int64']
+#   define: '-DENABLE_64BIT_INTEGERS={0}'.format(arguments['--int64'])
 
 option(ENABLE_64BIT_INTEGERS "Enable 64-bit integers" OFF)
 
diff --git a/modules/math/accelerate.cmake b/modules/math/accelerate.cmake
index 36eb3ce..529f9c2 100644
--- a/modules/math/accelerate.cmake
+++ b/modules/math/accelerate.cmake
@@ -11,7 +11,7 @@
 # autocmake.cfg configuration::
 #
 #   docopt: --accelerate Find and link to ACCELERATE [default: False].
-#   define: '-DENABLE_ACCELERATE=%s' % arguments['--accelerate']
+#   define: '-DENABLE_ACCELERATE={0}'.format(arguments['--accelerate'])
 #   fetch: https://github.com/coderefinery/autocmake/raw/master/modules/find/find_libraries.cmake
 #          https://github.com/coderefinery/autocmake/raw/master/modules/find/find_include_files.cmake
 
diff --git a/modules/math/acml.cmake b/modules/math/acml.cmake
index 01a375c..a533adf 100644
--- a/modules/math/acml.cmake
+++ b/modules/math/acml.cmake
@@ -11,7 +11,7 @@
 # autocmake.cfg configuration::
 #
 #   docopt: --acml Find and link to ACML [default: False].
-#   define: '-DENABLE_ACML=%s' % arguments['--acml']
+#   define: '-DENABLE_ACML={0}'.format(arguments['--acml'])
 
 option(ENABLE_ACML "Find and link to ACML" OFF)
 
diff --git a/modules/math/atlas.cmake b/modules/math/atlas.cmake
index 64c5bab..37b47c2 100644
--- a/modules/math/atlas.cmake
+++ b/modules/math/atlas.cmake
@@ -11,7 +11,7 @@
 # autocmake.cfg configuration::
 #
 #   docopt: --atlas Find and link to ATLAS [default: False].
-#   define: '-DENABLE_ATLAS=%s' % arguments['--atlas']
+#   define: '-DENABLE_ATLAS={0}'.format(arguments['--atlas'])
 
 option(ENABLE_ATLAS "Find and link to ATLAS" OFF)
 
diff --git a/modules/math/blas.cmake b/modules/math/blas.cmake
index fdcda94..47da0b1 100644
--- a/modules/math/blas.cmake
+++ b/modules/math/blas.cmake
@@ -11,7 +11,7 @@
 # autocmake.cfg configuration::
 #
 #   docopt: --blas Find and link to BLAS [default: False].
-#   define: '-DENABLE_BLAS=%s' % arguments['--blas']
+#   define: '-DENABLE_BLAS={0}'.format(arguments['--blas'])
 
 option(ENABLE_BLAS "Find and link to BLAS" OFF)
 
diff --git a/modules/math/cblas.cmake b/modules/math/cblas.cmake
index 378cf9b..4d2fe09 100644
--- a/modules/math/cblas.cmake
+++ b/modules/math/cblas.cmake
@@ -11,7 +11,7 @@
 # autocmake.cfg configuration::
 #
 #   docopt: --cblas Find and link to CBLAS [default: False].
-#   define: '-DENABLE_CBLAS=%s' % arguments['--cblas']
+#   define: '-DENABLE_CBLAS={0}'.format(arguments['--cblas'])
 #   fetch: https://github.com/coderefinery/autocmake/raw/master/modules/find/find_libraries.cmake
 #          https://github.com/coderefinery/autocmake/raw/master/modules/find/find_include_files.cmake
 
diff --git a/modules/math/goto.cmake b/modules/math/goto.cmake
index df9fb6d..0c3e269 100644
--- a/modules/math/goto.cmake
+++ b/modules/math/goto.cmake
@@ -11,7 +11,7 @@
 # autocmake.cfg configuration::
 #
 #   docopt: --goto Find and link to GOTO [default: False].
-#   define: '-DENABLE_GOTO=%s' % arguments['--goto']
+#   define: '-DENABLE_GOTO={0}'.format(arguments['--goto'])
 
 option(ENABLE_GOTO "Find and link to GOTO" OFF)
 
diff --git a/modules/math/lapack.cmake b/modules/math/lapack.cmake
index e86e53e..799eee4 100644
--- a/modules/math/lapack.cmake
+++ b/modules/math/lapack.cmake
@@ -11,7 +11,7 @@
 # autocmake.cfg configuration::
 #
 #   docopt: --lapack Find and link to LAPACK [default: False].
-#   define: '-DENABLE_LAPACK=%s' % arguments['--lapack']
+#   define: '-DENABLE_LAPACK={0}'.format(arguments['--lapack'])
 
 option(ENABLE_LAPACK "Find and link to LAPACK" OFF)
 
diff --git a/modules/math/lapacke.cmake b/modules/math/lapacke.cmake
index 3afbeab..5d93ff5 100644
--- a/modules/math/lapacke.cmake
+++ b/modules/math/lapacke.cmake
@@ -11,7 +11,7 @@
 # autocmake.cfg configuration::
 #
 #   docopt: --lapacke Find and link to LAPACKE [default: False].
-#   define: '-DENABLE_LAPACKE=%s' % arguments['--lapacke']
+#   define: '-DENABLE_LAPACKE={0}'.format(arguments['--lapacke'])
 #   fetch: https://github.com/coderefinery/autocmake/raw/master/modules/find/find_libraries.cmake
 #          https://github.com/coderefinery/autocmake/raw/master/modules/find/find_include_files.cmake
 
diff --git a/modules/math_libs.cmake b/modules/math_libs.cmake
index e3d3bf2..23c64c9 100644
--- a/modules/math_libs.cmake
+++ b/modules/math_libs.cmake
@@ -42,9 +42,9 @@
 #   docopt: --blas=<BLAS> Detect and link BLAS library (auto or off) [default: auto].
 #           --lapack=<LAPACK> Detect and link LAPACK library (auto or off) [default: auto].
 #           --mkl=<MKL> Pass MKL flag to the Intel compiler and linker and skip BLAS/LAPACK detection (sequential, parallel, cluster, or off) [default: off].
-#   define: '-DENABLE_BLAS=%s' % arguments['--blas']
-#           '-DENABLE_LAPACK=%s' % arguments['--lapack']
-#           '-DMKL_FLAG=%s' % arguments['--mkl']
+#   define: '-DENABLE_BLAS={0}'.format(arguments['--blas'])
+#           '-DENABLE_LAPACK={0}'.format(arguments['--lapack'])
+#           '-DMKL_FLAG={0}'.format(arguments['--mkl'])
 #           '-DMATH_LIB_SEARCH_ORDER="MKL;ESSL;OPENBLAS;ATLAS;ACML;SYSTEM_NATIVE"'
 #           '-DBLAS_LANG=Fortran'
 #           '-DLAPACK_LANG=Fortran'
diff --git a/modules/mpi.cmake b/modules/mpi.cmake
index 7f73eac..cb64a41 100644
--- a/modules/mpi.cmake
+++ b/modules/mpi.cmake
@@ -16,7 +16,7 @@
 # autocmake.cfg configuration::
 #
 #   docopt: --mpi Enable MPI parallelization [default: False].
-#   define: '-DENABLE_MPI=%s' % arguments['--mpi']
+#   define: '-DENABLE_MPI={0}'.format(arguments['--mpi'])
 
 option(ENABLE_MPI "Enable MPI parallelization" OFF)
 
diff --git a/modules/omp.cmake b/modules/omp.cmake
index 9784868..1a6e9b4 100644
--- a/modules/omp.cmake
+++ b/modules/omp.cmake
@@ -16,7 +16,7 @@
 # autocmake.cfg configuration::
 #
 #   docopt: --omp Enable OpenMP parallelization [default: False].
-#   define: '-DENABLE_OPENMP=%s' % arguments['--omp']
+#   define: '-DENABLE_OPENMP={0}'.format(arguments['--omp'])
 
 option(ENABLE_OPENMP "Enable OpenMP parallelization" OFF)
 
diff --git a/modules/python_interpreter.cmake b/modules/python_interpreter.cmake
index a726da9..54509a0 100644
--- a/modules/python_interpreter.cmake
+++ b/modules/python_interpreter.cmake
@@ -18,7 +18,7 @@
 # autocmake.cfg configuration::
 #
 #   docopt: --python=<PYTHON_INTERPRETER> The Python interpreter (development version) to use. [default: ''].
-#   define: '-DPYTHON_INTERPRETER="%s"' % arguments['--python']
+#   define: '-DPYTHON_INTERPRETER="{0}"'.format(arguments['--python'])
 
 if("${PYTHON_INTERPRETER}" STREQUAL "")
     find_package(PythonInterp REQUIRED)