diff --git a/Kernel_23/include/CGAL/Bbox_2.h b/Kernel_23/include/CGAL/Bbox_2.h
index 60d48dbbc93..e90bcf00e07 100644
--- a/Kernel_23/include/CGAL/Bbox_2.h
+++ b/Kernel_23/include/CGAL/Bbox_2.h
@@ -193,7 +193,7 @@ operator>>(std::istream &is, Bbox_2 &b)
 
     switch(is.iword(IO::mode)) {
     case IO::ASCII :
-      is >> iformat(xmin) >> iformat(ymin) >> iformat(xmax) >> iformat(ymax);
+        is >> iformat(xmin) >> iformat(ymin) >> iformat(xmax) >> iformat(ymax);
         break;
     case IO::BINARY :
         read(is, xmin);
diff --git a/Kernel_23/include/CGAL/Circle_2.h b/Kernel_23/include/CGAL/Circle_2.h
index 403af712ef2..f31db794fbb 100644
--- a/Kernel_23/include/CGAL/Circle_2.h
+++ b/Kernel_23/include/CGAL/Circle_2.h
@@ -273,7 +273,7 @@ extract(std::istream& is, Circle_2<R>& c)
     int o;
     switch(is.iword(IO::mode)) {
     case IO::ASCII :
-      is >> center >> iformat(squared_radius) >> o;
+        is >> center >> iformat(squared_radius) >> o;
         break;
     case IO::BINARY :
         is >> center;
diff --git a/Kernel_23/include/CGAL/Direction_3.h b/Kernel_23/include/CGAL/Direction_3.h
index 1d3a7dc5fe6..5abeeb55e63 100644
--- a/Kernel_23/include/CGAL/Direction_3.h
+++ b/Kernel_23/include/CGAL/Direction_3.h
@@ -213,7 +213,7 @@ extract(std::istream& is, Direction_3<R>& d, const Homogeneous_tag&)
   switch(is.iword(IO::mode))
   {
     case IO::ASCII :
-      is >> iformat(x) >> iformat(y) >> iformat(z);
+        is >> iformat(x) >> iformat(y) >> iformat(z);
         break;
     case IO::BINARY :
         read(is, x);
diff --git a/Kernel_23/include/CGAL/Line_2.h b/Kernel_23/include/CGAL/Line_2.h
index ab5d800dfa4..239dfd6dfbc 100644
--- a/Kernel_23/include/CGAL/Line_2.h
+++ b/Kernel_23/include/CGAL/Line_2.h
@@ -262,7 +262,7 @@ extract(std::istream& is, Line_2<R>& l)
     typename R::RT a, b, c;
     switch(is.iword(IO::mode)) {
     case IO::ASCII :
-      is >> iformat(a) >> iformat(b) >> iformat(c);
+        is >> iformat(a) >> iformat(b) >> iformat(c);
         break;
     case IO::BINARY :
         read(is, a);
diff --git a/Kernel_23/include/CGAL/Plane_3.h b/Kernel_23/include/CGAL/Plane_3.h
index cf34773010e..79acd6cb991 100644
--- a/Kernel_23/include/CGAL/Plane_3.h
+++ b/Kernel_23/include/CGAL/Plane_3.h
@@ -258,7 +258,7 @@ operator>>(std::istream &is, Plane_3<R> &p)
     typename R::RT a, b, c, d;
     switch(is.iword(IO::mode)) {
     case IO::ASCII :
-      is >> iformat(a) >> iformat(b) >> iformat(c) >> iformat(d);
+        is >> iformat(a) >> iformat(b) >> iformat(c) >> iformat(d);
         break;
     case IO::BINARY :
         read(is, a);
diff --git a/Kernel_23/include/CGAL/Point_3.h b/Kernel_23/include/CGAL/Point_3.h
index 7d17190b511..1343826ec3f 100644
--- a/Kernel_23/include/CGAL/Point_3.h
+++ b/Kernel_23/include/CGAL/Point_3.h
@@ -246,7 +246,7 @@ extract(std::istream& is, Point_3<R>& p, const Cartesian_tag&)
     typename R::FT x, y, z;
     switch(is.iword(IO::mode)) {
     case IO::ASCII :
-      is >> iformat(x) >> iformat(y) >> iformat(z);
+        is >> iformat(x) >> iformat(y) >> iformat(z);
         break;
     case IO::BINARY :
         read(is, x);
diff --git a/Stream_support/include/CGAL/IO/File_scanner_OFF.h b/Stream_support/include/CGAL/IO/File_scanner_OFF.h
index 7c5d9174f05..00227a0f943 100644
--- a/Stream_support/include/CGAL/IO/File_scanner_OFF.h
+++ b/Stream_support/include/CGAL/IO/File_scanner_OFF.h
@@ -203,7 +203,7 @@ public:
             m_in >> iformat(d);
             z = int(d);
             if ( is_homogeneous()) {
-              m_in >> iformat(d);
+                m_in >> iformat(d);
                 w = int(d);
             }
         }
@@ -224,7 +224,7 @@ public:
                     z /= w;
                 }
             } else {
-              m_in >> iformat(x) >> iformat(y) >> iformat(z);
+                m_in >> iformat(x) >> iformat(y) >> iformat(z);
                 if ( is_homogeneous()) {
                     float w;
                     m_in >> iformat(w);
@@ -262,7 +262,7 @@ public:
                     y = fy / fw;
                     z = fz / fw;
                 } else
-                  m_in >> iformat(x) >> iformat(y) >> iformat(z);
+                    m_in >> iformat(x) >> iformat(y) >> iformat(z);
             }
         }
     }
@@ -316,9 +316,9 @@ public:
                 if ( is_homogeneous())
                     I_Binary_read_big_endian_float32( m_in, w);
             } else {
-              m_in >> iformat(x) >> iformat(y) >> iformat(z);
+                m_in >> iformat(x) >> iformat(y) >> iformat(z);
                 if ( is_homogeneous())
-                  m_in >> iformat(w);
+                    m_in >> iformat(w);
             }
         }
     }
@@ -339,9 +339,9 @@ public:
                     w = f;
                 }
             } else {
-              m_in >> iformat(x) >> iformat(y) >> iformat(z);
+                m_in >> iformat(x) >> iformat(y) >> iformat(z);
                 if ( is_homogeneous())
-                  m_in >> iformat(w);
+                    m_in >> iformat(w);
             }
         }
     }
@@ -370,7 +370,7 @@ public:
                 m_in >> iformat(d);
                 z = int(d);
                 if ( is_homogeneous()) {
-                  m_in >> iformat(d);
+                    m_in >> iformat(d);
                     w = int(d);
                 }
             }