diff --git a/src/gmio_core/internal/stringstream.c b/src/gmio_core/internal/stringstream.c
index ebfd3ba..9064ea6 100644
--- a/src/gmio_core/internal/stringstream.c
+++ b/src/gmio_core/internal/stringstream.c
@@ -53,6 +53,13 @@ void gmio_stringstream_init_pos(struct gmio_stringstream *sstream)
     gmio_stringstream_next_char(sstream);
 }
 
+size_t gmio_stringstream_default_func_read(
+        void* cookie, struct gmio_stream* stream, char* ptr, size_t len)
+{
+    GMIO_UNUSED(cookie);
+    return gmio_stream_read(stream, ptr, 1, len);
+}
+
 enum gmio_eat_word_error gmio_stringstream_eat_word(
         struct gmio_stringstream *sstream,
         struct gmio_string *str)
diff --git a/src/gmio_core/internal/stringstream.h b/src/gmio_core/internal/stringstream.h
index b5901cf..dd9b8d4 100644
--- a/src/gmio_core/internal/stringstream.h
+++ b/src/gmio_core/internal/stringstream.h
@@ -73,7 +73,7 @@ struct gmio_stringstream gmio_stringstream(
 void gmio_stringstream_init_pos(struct gmio_stringstream* sstream);
 
 /*! Default function for gmio_stringstream::func_stream_read */
-GMIO_INLINE size_t gmio_stringstream_default_func_read(
+size_t gmio_stringstream_default_func_read(
         void* cookie, struct gmio_stream* stream, char* ptr, size_t len);
 
 /*! Returns the char where the iterator is currently pointing at */
@@ -144,7 +144,6 @@ GMIO_INLINE float gmio_to_float32(const char* str);
  */
 
 #include "c99_stdlib_compat.h"
-#include "helper_stream.h"
 #include "string_ascii_utils.h"
 #if GMIO_STR2FLOAT_LIB == GMIO_STR2FLOAT_LIB_IRRLICHT
 #  include "fast_atof.h"
@@ -163,13 +162,6 @@ const char* gmio_stringstream_current_char(
                 NULL;
 }
 
-size_t gmio_stringstream_default_func_read(
-        void* cookie, struct gmio_stream* stream, char* ptr, size_t len)
-{
-    GMIO_UNUSED(cookie);
-    return gmio_stream_read(stream, ptr, 1, len);
-}
-
 const char *gmio_stringstream_next_char(struct gmio_stringstream *sstream)
 {
     ++(sstream->strbuff_at);