diff --git a/source/texk/ptexenc/ptexenc.c b/source/texk/ptexenc/ptexenc.c
index d77f5adb7..461565d2c 100644
--- a/source/texk/ptexenc/ptexenc.c
+++ b/source/texk/ptexenc/ptexenc.c
@@ -1150,7 +1150,7 @@ void clear_infile_enc(FILE *fp)
 {
     infile_enc[fileno(fp)] = ENC_UNKNOWN;
 }
-long ptencconvfirstline(long pos, long last, unsigned char *buff, const long buffsize)
+long ptenc_conv_first_line(long pos, long last, unsigned char *buff, const long buffsize)
 {
    return last;
 }
@@ -1365,7 +1365,7 @@ int ptenc_get_command_line_args(int *p_ac, char ***p_av)
     return 0;
 }
 
-long ptencconvfirstline(long pos, long last, unsigned char *buff, const long buffsize)
+long ptenc_conv_first_line(long pos, long last, unsigned char *buff, const long buffsize)
   /* return new last */
 {
     unsigned char *old, *new_buf; long new_last, i;
diff --git a/source/texk/ptexenc/ptexenc/ptexenc.h b/source/texk/ptexenc/ptexenc/ptexenc.h
index 0c9fbafdc..f3c8ff174 100644
--- a/source/texk/ptexenc/ptexenc/ptexenc.h
+++ b/source/texk/ptexenc/ptexenc/ptexenc.h
@@ -112,6 +112,6 @@ extern PTENCDLL unsigned char *ptenc_from_utf8_string_to_internal_enc(const unsi
 extern PTENCDLL unsigned char *ptenc_from_internal_enc_string_to_utf8(const unsigned char *is);
 extern PTENCDLL int ptenc_get_command_line_args(int *p_ac, char ***p_av);
 #endif
-extern PTENCDLL long ptencconvfirstline(long pos, long limit, unsigned char *buff, const long buffsize);
+extern PTENCDLL long ptenc_conv_first_line(long pos, long limit, unsigned char *buff, const long buffsize);
 
 #endif /* PTEXENC_PTEXENC_H */
diff --git a/source/texk/web2c/ptexdir/kanji.h b/source/texk/web2c/ptexdir/kanji.h
index 91038154f..b1916cc2c 100644
--- a/source/texk/web2c/ptexdir/kanji.h
+++ b/source/texk/web2c/ptexdir/kanji.h
@@ -72,6 +72,7 @@ extern void init_default_kanji (const_string file_str, const_string internal_str
 #else
 #define inputline2(fp,buff,pos,size) input_line2(fp,buff,NULL,pos,size,NULL)
 #endif
+#define ptencconvfirstline(pos,limit,buff,size) ptenc_conv_first_line(pos,limit,buff,size)
 
 extern void dump_kanji (gzFile fp);
 extern void undump_kanji (gzFile fp);
diff --git a/source/texk/web2c/uptexdir/kanji.h b/source/texk/web2c/uptexdir/kanji.h
index cbdd47f24..6109288af 100644
--- a/source/texk/web2c/uptexdir/kanji.h
+++ b/source/texk/web2c/uptexdir/kanji.h
@@ -66,6 +66,7 @@ extern void init_default_kanji_select (void);
 #else
 #define inputline2(fp,buff,pos,size) input_line2(fp,buff,NULL,pos,size,NULL)
 #endif
+#define ptencconvfirstline(pos,limit,buff,size) ptenc_conv_first_line(pos,limit,buff,size)
 
 extern void init_kanji (const_string file_str, const_string internal_str);
 extern void dump_kanji (gzFile fp);