diff --git a/alib2algo/src/string/properties/PeriodicPrefix.h b/alib2algo/src/string/properties/PeriodicPrefix.h
index 7eeb5403e83d78046488dc92bd1901b8d1750c67..a631ca9d257af394638da13ef562b29d4e2f5d85 100644
--- a/alib2algo/src/string/properties/PeriodicPrefix.h
+++ b/alib2algo/src/string/properties/PeriodicPrefix.h
@@ -5,9 +5,7 @@
 
 #include <string/LinearString.h>
 
-namespace string {
-
-namespace properties {
+namespace string::properties {
 
 class PeriodicPrefix {
 public:
@@ -58,6 +56,4 @@ ext::pair < size_t, size_t > PeriodicPrefix::construct ( const string::LinearStr
 	return ext::make_pair ( maxlen, maxper );
 }
 
-} /* namespace properties */
-
-} /* namespace string */
+} /* namespace string::properties */