diff --git a/backuphelper.cpp b/backuphelper.cpp
index 38e9dc4..16122f6 100644
--- a/backuphelper.cpp
+++ b/backuphelper.cpp
@@ -128,7 +128,7 @@ void createBackupFile(const std::string &originalPath, std::string &backupPath,
     for(unsigned int i = 0; ; ++i) {
         if(backupDir.empty()) {
             if(i) {
-                backupPath = originalPath % '.' % numberToString(i) + ".bak";
+                backupPath = originalPath % '.' % i + ".bak";
             } else {
                 backupPath = originalPath + ".bak";
             }
diff --git a/id3/id3v2tag.cpp b/id3/id3v2tag.cpp
index ace4c77..510e021 100644
--- a/id3/id3v2tag.cpp
+++ b/id3/id3v2tag.cpp
@@ -313,7 +313,7 @@ void Id3v2Tag::setVersion(byte majorVersion, byte revisionVersion)
 {
     m_majorVersion = majorVersion;
     m_revisionVersion = revisionVersion;
-    m_version = '2' % '.' % numberToString(majorVersion) % '.' + numberToString(revisionVersion);
+    m_version = argsToString('2', '.', majorVersion, '.', revisionVersion);
 }
 
 /*!
diff --git a/margin.h b/margin.h
index 6908267..43ce92b 100644
--- a/margin.h
+++ b/margin.h
@@ -4,7 +4,6 @@
 #include "./global.h"
 
 #include <c++utilities/conversion/types.h>
-#include <c++utilities/conversion/stringconversion.h>
 #include <c++utilities/conversion/stringbuilder.h>
 
 #include <string>
@@ -123,11 +122,7 @@ inline constexpr bool Margin::isNull() const
  */
 inline std::string Margin::toString() const
 {
-    using namespace ConversionUtilities;
-    return "top: " % numberToString(m_top)
-            % "; left: " % numberToString(m_left)
-            % "; bottom: " % numberToString(m_bottom)
-            % "; right: " + numberToString(m_right);
+    return ConversionUtilities::argsToString("top: ", m_top, "; left: ", m_left, "; bottom: ", m_bottom, "; right: ", m_right);
 }
 
 }
diff --git a/matroska/ebmlelement.cpp b/matroska/ebmlelement.cpp
index 02e1b3f..27d9917 100644
--- a/matroska/ebmlelement.cpp
+++ b/matroska/ebmlelement.cpp
@@ -68,7 +68,7 @@ void EbmlElement::internalParse()
     for(skipped = 0; /* TODO: add a sane limit here */; ++m_startOffset, --m_maxSize, ++skipped) {
         // check whether max size is valid
         if(maxTotalSize() < 2) {
-            addNotification(NotificationType::Critical, "The EBML element at " % numberToString(startOffset()) + " is truncated or does not exist.", context);
+            addNotification(NotificationType::Critical, argsToString("The EBML element at ", startOffset(), " is truncated or does not exist."), context);
             throw TruncatedDataException();
         }
         stream().seekg(startOffset());
diff --git a/mp4/mp4atom.cpp b/mp4/mp4atom.cpp
index 46be2eb..71a3b41 100644
--- a/mp4/mp4atom.cpp
+++ b/mp4/mp4atom.cpp
@@ -49,7 +49,7 @@ Mp4Atom::Mp4Atom(GenericFileElement::implementationType &parent, uint64 startOff
  */
 string Mp4Atom::parsingContext() const
 {
-    return "parsing " % idToString() % " atom at " + numberToString(startOffset());
+    return "parsing " % idToString() % " atom at " + startOffset();
 }
 
 /*!
diff --git a/mp4/mpeg4descriptor.cpp b/mp4/mpeg4descriptor.cpp
index 53a5faf..06bae9c 100644
--- a/mp4/mpeg4descriptor.cpp
+++ b/mp4/mpeg4descriptor.cpp
@@ -36,7 +36,7 @@ Mpeg4Descriptor::Mpeg4Descriptor(implementationType &parent, uint64 startOffset)
  */
 string Mpeg4Descriptor::parsingContext() const
 {
-    return "parsing " % idToString() % " descriptor at " + numberToString(startOffset());
+    return "parsing " % idToString() % " descriptor at " + startOffset();
 }
 
 /*!
diff --git a/size.h b/size.h
index 7f75185..7700967 100644
--- a/size.h
+++ b/size.h
@@ -4,7 +4,6 @@
 #include "./global.h"
 
 #include <c++utilities/conversion/types.h>
-#include <c++utilities/conversion/stringconversion.h>
 #include <c++utilities/conversion/stringbuilder.h>
 
 #include <string>
@@ -103,8 +102,7 @@ inline constexpr bool Size::operator==(const Size &other) const
  */
 inline std::string Size::toString() const
 {
-    using namespace ConversionUtilities;
-    return "width: " % numberToString(m_width) % ", height: " + numberToString(m_height);
+    return ConversionUtilities::argsToString("width: ", m_width, ", height: ", m_height);
 }
 
 }