diff --git a/dune/fufem/matlab_io.hh b/dune/fufem/matlab_io.hh
index 987347ae1b751a92784dc688eeba315297fce939..e2623ad80b4a2cd7bf265918523921668110d9e1 100644
--- a/dune/fufem/matlab_io.hh
+++ b/dune/fufem/matlab_io.hh
@@ -2,7 +2,7 @@
 #define MATLAB_IO_HH
 
 #include <array>
-#include <stdio.h>
+#include <cstdio>
 #include <string>
 
 #include <dune/common/exceptions.hh>
diff --git a/dune/fufem/test/basisgridfunctiontest.cc b/dune/fufem/test/basisgridfunctiontest.cc
index 8e43aa81d6418aef37c1cc250059c9f3779ccc7d..d4a87ea4249b9d03d0a9aafaa52d75f960ebae5e 100644
--- a/dune/fufem/test/basisgridfunctiontest.cc
+++ b/dune/fufem/test/basisgridfunctiontest.cc
@@ -1,6 +1,6 @@
 #include <config.h>
 
-#include <stdio.h>
+#include <cstdio>
 //#define DUNE_FMatrix_WITH_CHECKING 1
 
 #include <dune/common/parallel/mpihelper.hh>
diff --git a/dune/fufem/test/composedfunctiontest.cc b/dune/fufem/test/composedfunctiontest.cc
index cf86f147539958fed9fc838a70f27acf962fa8fb..4a85933350dd50095e65a5153ab53feced799aa3 100644
--- a/dune/fufem/test/composedfunctiontest.cc
+++ b/dune/fufem/test/composedfunctiontest.cc
@@ -1,7 +1,7 @@
 #include <config.h>
 
 #include <cmath>
-#include <stdio.h>
+#include <cstdio>
 
 #include <dune/common/parallel/mpihelper.hh>
 #include <dune/common/exceptions.hh>
diff --git a/dune/fufem/test/functionintegratortest.cc b/dune/fufem/test/functionintegratortest.cc
index 1200d8fee2132f048f9d80478099aa6d97e44d50..4049e7d192a150562907c268088fc8c2bf1b64b9 100644
--- a/dune/fufem/test/functionintegratortest.cc
+++ b/dune/fufem/test/functionintegratortest.cc
@@ -2,7 +2,7 @@
 
 #include <array>
 #include <cmath>
-#include <stdio.h>
+#include <cstdio>
 #include <list>
 
 #include <dune/common/parallel/mpihelper.hh>
diff --git a/dune/fufem/test/generalizedlaplaceassemblertest.cc b/dune/fufem/test/generalizedlaplaceassemblertest.cc
index c9f85569cfbb10f2f425b8a07464857e00406523..1180b4144837565f8df7d276ae24d8df175c3d6c 100644
--- a/dune/fufem/test/generalizedlaplaceassemblertest.cc
+++ b/dune/fufem/test/generalizedlaplaceassemblertest.cc
@@ -1,7 +1,7 @@
 #include <config.h>
 
 #include <cmath>
-#include <stdio.h>
+#include <cstdio>
 #include <algorithm>
 
 #include <dune/common/parallel/mpihelper.hh>
diff --git a/dune/fufem/test/gradientassemblertest.cc b/dune/fufem/test/gradientassemblertest.cc
index 162a3c82db9a3153d478702eee129c86edc9f1dd..d5ce5a434f5a61de8afe35f2daeedbf039cbbeae 100644
--- a/dune/fufem/test/gradientassemblertest.cc
+++ b/dune/fufem/test/gradientassemblertest.cc
@@ -1,6 +1,6 @@
 #include <config.h>
 
-#include <stdio.h>
+#include <cstdio>
 #include <iomanip>
 
 #include <dune/common/parallel/mpihelper.hh>
diff --git a/dune/fufem/test/gridfunctiontest.cc b/dune/fufem/test/gridfunctiontest.cc
index d7f3cf35fcc5e428be2f9832b86c593e4b6e197d..01b192f0052c048a0f2fb9ff3d824c75a1fbcd48 100644
--- a/dune/fufem/test/gridfunctiontest.cc
+++ b/dune/fufem/test/gridfunctiontest.cc
@@ -1,7 +1,7 @@
 #include <config.h>
 
 #include <cmath>
-#include <stdio.h>
+#include <cstdio>
 
 #include <dune/common/parallel/mpihelper.hh>
 #include <dune/common/exceptions.hh>
diff --git a/dune/fufem/test/h1functionalassemblertest.cc b/dune/fufem/test/h1functionalassemblertest.cc
index f3172caaf3c6d21531f895faafb547640c8eca50..90ec153f5cc1ea267947ae91c61b02c5bec728d9 100644
--- a/dune/fufem/test/h1functionalassemblertest.cc
+++ b/dune/fufem/test/h1functionalassemblertest.cc
@@ -1,7 +1,7 @@
 #include <config.h>
 
 #include <cmath>
-#include <stdio.h>
+#include <cstdio>
 
 #include <dune/common/parallel/mpihelper.hh>
 #include <dune/common/exceptions.hh>
diff --git a/dune/fufem/test/pgmtest.cc b/dune/fufem/test/pgmtest.cc
index 0db41b32fca5c39d1838e1fea523beae0f1c470f..18ddd2df675b2d71ca05327c039f9c9033ba1d4f 100644
--- a/dune/fufem/test/pgmtest.cc
+++ b/dune/fufem/test/pgmtest.cc
@@ -1,6 +1,6 @@
 #include <config.h>
 
-#include <stdio.h>
+#include <cstdio>
 #include <array>
 
 #include <dune/common/parallel/mpihelper.hh>
diff --git a/dune/fufem/test/polynomialtest.cc b/dune/fufem/test/polynomialtest.cc
index 26728526e64ee0a4883ea5d4688bacab32f12e9b..5bd5035297d52eefc3c59b2a021ceb556039242f 100644
--- a/dune/fufem/test/polynomialtest.cc
+++ b/dune/fufem/test/polynomialtest.cc
@@ -1,7 +1,7 @@
 #include <config.h>
 
 #include <cmath>
-#include <stdio.h>
+#include <cstdio>
 
 #include <dune/common/parallel/mpihelper.hh>
 #include <dune/common/exceptions.hh>
diff --git a/dune/fufem/test/ppmtest.cc b/dune/fufem/test/ppmtest.cc
index 87a3c4f6881fb130c36c8b1fffd6a0374dcf9885..b1152d458216f407e9dc7fcec018d653ed6e5f03 100644
--- a/dune/fufem/test/ppmtest.cc
+++ b/dune/fufem/test/ppmtest.cc
@@ -1,6 +1,6 @@
 #include <config.h>
 
-#include <stdio.h>
+#include <cstdio>
 
 #include <dune/common/parallel/mpihelper.hh>
 #include <dune/common/exceptions.hh>
diff --git a/dune/fufem/test/subgridxyfunctionalassemblertest.cc b/dune/fufem/test/subgridxyfunctionalassemblertest.cc
index 501a1199289d6ee51d6117b183fb8e59de6d937d..6cc8afdf32ad98834fef61d482de605d3f0331b7 100644
--- a/dune/fufem/test/subgridxyfunctionalassemblertest.cc
+++ b/dune/fufem/test/subgridxyfunctionalassemblertest.cc
@@ -1,6 +1,6 @@
 #include <config.h>
 
-#include <stdio.h>
+#include <cstdio>
 #include <map>
 #include <vector>
 
diff --git a/dune/fufem/test/sumfunctiontest.cc b/dune/fufem/test/sumfunctiontest.cc
index 17b4fb522ce028eec4cda9d9dd986dee1c604fcd..b0ba83082458e25dbdd1509b92d74a3bb377a037 100644
--- a/dune/fufem/test/sumfunctiontest.cc
+++ b/dune/fufem/test/sumfunctiontest.cc
@@ -1,7 +1,7 @@
 #include <config.h>
 
 #include <cmath>
-#include <stdio.h>
+#include <cstdio>
 
 #include <dune/common/parallel/mpihelper.hh>
 #include <dune/common/exceptions.hh>