diff --git a/CHANGELOG.md b/CHANGELOG.md
index 79bec5bde5..da953d0aeb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -30,6 +30,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - visibility title and labels.
 - object constructor must be in '@' directory and no more in parent directory (compatibility).
 - `subsref`, `subsasgn` compatibility with `substruct`.
+- To display a percent sign, you need to use a double percent sign (%%) in the format string (compatibility).
 - French translation updated (100%, Thanks to weblate contributors)
 - [#997](http://github.com/Nelson-numerical-software/nelson/issues/997) Macos BigSur Github CI support removed.
 - Qt 6.6.1 on win64 CI build.
diff --git a/modules/graphics/functions/pie.m b/modules/graphics/functions/pie.m
index d930fb5818..5ea77690cc 100644
--- a/modules/graphics/functions/pie.m
+++ b/modules/graphics/functions/pie.m
@@ -94,7 +94,7 @@ function validateExplode(haveExplode)
   end
   
   for i = 1:length(X)
-    labels{i} = sprintf('%d%', XL(i));
+    labels{i} = sprintf('%d%%', XL(i));
   end
 end
 %=============================================================================
diff --git a/modules/graphics/help/en_US/xml/pie.xml b/modules/graphics/help/en_US/xml/pie.xml
index 1c85184abe..88802385c6 100644
--- a/modules/graphics/help/en_US/xml/pie.xml
+++ b/modules/graphics/help/en_US/xml/pie.xml
@@ -29,7 +29,8 @@
 
 		<param_input_item>
 			<param_name>labels</param_name>
-			<param_description>'%.0f%' (default) or array of text labels</param_description>
+			<param_description
+      >'%.0f%%' (default) or array of text labels</param_description>
 		</param_input_item>
 
 		<param_input_item>
diff --git a/modules/stream_manager/help/en_US/xml/fprintf.xml b/modules/stream_manager/help/en_US/xml/fprintf.xml
index e9e7630393..30f0e5b140 100644
--- a/modules/stream_manager/help/en_US/xml/fprintf.xml
+++ b/modules/stream_manager/help/en_US/xml/fprintf.xml
@@ -136,6 +136,8 @@
 </tr>
      </table>
 
+  <p
+    >To display a percent sign, you need to use a double percent sign (%%) in the format string.</p>
   </description>
 
   <used_function />
@@ -183,6 +185,13 @@ end
   
   </example_item>
 
+  <example_item>
+    <example_item_type>nelson</example_item_type>
+    <example_item_description>Display a percent sign</example_item_description>
+    <example_item_data><![CDATA[fprintf(1, '%d%%.', 95)]]>
+    </example_item_data>
+  </example_item>
+
 
 </examples>
 
diff --git a/modules/stream_manager/src/cpp/PrintfFunction.cpp b/modules/stream_manager/src/cpp/PrintfFunction.cpp
index 2c20d83702..5f0ac67491 100644
--- a/modules/stream_manager/src/cpp/PrintfFunction.cpp
+++ b/modules/stream_manager/src/cpp/PrintfFunction.cpp
@@ -90,6 +90,7 @@ printfFunction(const ArrayOfVector& args, std::wstring& errorMessage, std::wstri
             if (*(dp + 1) == L'\0') {
                 return true;
             }
+            dp += 2;
         }
         if (*dp == L'%' && *(dp + 1)) {
             np = PrintfHelper::validateFormatSpec(dp + 1);
diff --git a/modules/stream_manager/tests/test_fprintf.m b/modules/stream_manager/tests/test_fprintf.m
index 8607abdf36..94ac465bd2 100644
--- a/modules/stream_manager/tests/test_fprintf.m
+++ b/modules/stream_manager/tests/test_fprintf.m
@@ -51,3 +51,7 @@
 assert_istrue(iscellstr(ce));
 assert_istrue(any(contains(ce, 'windows-1251')));
 %=============================================================================
+R = evalc('fprintf(1,''%d%%.'',50)')
+REF = '50%.';
+assert_isequal(R, REF);
+%=============================================================================
\ No newline at end of file
diff --git a/modules/string/help/en_US/xml/sprintf.xml b/modules/string/help/en_US/xml/sprintf.xml
index 42515787cf..c1808ca1f7 100644
--- a/modules/string/help/en_US/xml/sprintf.xml
+++ b/modules/string/help/en_US/xml/sprintf.xml
@@ -117,7 +117,8 @@
 <td>Character vector.</td>
 </tr>
      </table>
-
+  <p
+    >To display a percent sign, you need to use a double percent sign (%%) in the format string.</p>
   </description>
 
   <used_function />
@@ -146,10 +147,14 @@
     <example_item_description />
     <example_item_data><![CDATA[sprintf('an value %g.', pi)]]>
     </example_item_data>
-  
   </example_item>
 
-
+  <example_item>
+    <example_item_type>nelson</example_item_type>
+    <example_item_description>Display a percent sign</example_item_description>
+    <example_item_data><![CDATA[sprintf('%d%%.', 95)]]>
+    </example_item_data>
+  </example_item>
 </examples>
 
   <see_also>
diff --git a/modules/string/tests/test_sprintf.m b/modules/string/tests/test_sprintf.m
index 491301e724..7f317cc452 100644
--- a/modules/string/tests/test_sprintf.m
+++ b/modules/string/tests/test_sprintf.m
@@ -200,3 +200,7 @@
 REF = '20 %.';
 assert_isequal(R, REF);
 %=============================================================================
+R = sprintf('%d%%.',50);
+REF = '50%.';
+assert_isequal(R, REF);
+%=============================================================================
\ No newline at end of file