diff --git a/include/etl/u16string_stream.h b/include/etl/u16string_stream.h
index 859fd559..e057911a 100644
--- a/include/etl/u16string_stream.h
+++ b/include/etl/u16string_stream.h
@@ -36,7 +36,6 @@ SOFTWARE.
 #include "platform.h"
 #include "u16string.h"
 #include "u16format_spec.h"
-#include "to_u16string.h"
 #include "string_view.h"
 #include "basic_string_stream.h"
 
diff --git a/include/etl/u32string_stream.h b/include/etl/u32string_stream.h
index b2266af7..f9a8b0d7 100644
--- a/include/etl/u32string_stream.h
+++ b/include/etl/u32string_stream.h
@@ -36,7 +36,6 @@ SOFTWARE.
 #include "platform.h"
 #include "u32string.h"
 #include "u32format_spec.h"
-#include "to_u32string.h"
 #include "string_view.h"
 #include "basic_string_stream.h"
 
diff --git a/include/etl/u8string_stream.h b/include/etl/u8string_stream.h
index 675f8022..df6b7088 100644
--- a/include/etl/u8string_stream.h
+++ b/include/etl/u8string_stream.h
@@ -36,7 +36,6 @@ SOFTWARE.
 #include "platform.h"
 #include "u8string.h"
 #include "u8format_spec.h"
-#include "to_u8string.h"
 #include "string_view.h"
 #include "basic_string_stream.h"
 
diff --git a/include/etl/wstring_stream.h b/include/etl/wstring_stream.h
index e0a8bb8f..29ad4b2f 100644
--- a/include/etl/wstring_stream.h
+++ b/include/etl/wstring_stream.h
@@ -36,7 +36,6 @@ SOFTWARE.
 #include "platform.h"
 #include "string.h"
 #include "wformat_spec.h"
-#include "to_wstring.h"
 #include "string_view.h"
 #include "basic_string_stream.h"