diff --git a/docs/libcurl/curl_easy_escape.3 b/docs/libcurl/curl_easy_escape.3
index da2b382215cb469a2b5546bcae469752e153c371..76a116ac5fa61132328cfc14c1ef15a05e647d63 100644
--- a/docs/libcurl/curl_easy_escape.3
+++ b/docs/libcurl/curl_easy_escape.3
@@ -26,7 +26,8 @@ curl_easy_escape - URL encodes the given string
 .SH SYNOPSIS
 .B #include <curl/curl.h>
 .sp
-.BI "char *curl_easy_escape( CURL *" curl ", char *" string ", int "length " );"
+.BI "char *curl_easy_escape( CURL *" curl ", const char *" string
+.BI ", int "length " );"
 .ad
 .SH DESCRIPTION
 This function converts the given input \fIstring\fP to a URL encoded string
diff --git a/docs/libcurl/curl_easy_unescape.3 b/docs/libcurl/curl_easy_unescape.3
index 23ce9c3c2930d66bf9ae7ef7d970fba5a1a6b0fd..c804b401c80f5eebacffd35b1244f8a96b3209a6 100644
--- a/docs/libcurl/curl_easy_unescape.3
+++ b/docs/libcurl/curl_easy_unescape.3
@@ -26,8 +26,8 @@ curl_easy_unescape - URL decodes the given string
 .SH SYNOPSIS
 .B #include <curl/curl.h>
 .sp
-.BI "char *curl_easy_unescape( CURL *" curl ", char *" url ", int "inlength
-.BI ", int *" outlength " );"
+.BI "char *curl_easy_unescape( CURL *" curl ", const char *" url
+.BI ", int "inlength ", int *" outlength " );"
 .ad
 .SH DESCRIPTION
 This function converts the given URL encoded input string to a "plain string"
diff --git a/docs/libcurl/curl_escape.3 b/docs/libcurl/curl_escape.3
index 75fd51f2d0a6081538b68d54c1a9aac9968a4904..dca08083f9bbc79c8e9bc781193224dcbc19df01 100644
--- a/docs/libcurl/curl_escape.3
+++ b/docs/libcurl/curl_escape.3
@@ -25,7 +25,7 @@ curl_escape - URL encodes the given string
 .SH SYNOPSIS
 .B #include <curl/curl.h>
 .sp
-.BI "char *curl_escape( char *" url ", int "length " );"
+.BI "char *curl_escape( const char *" url ", int "length " );"
 .ad
 .SH DESCRIPTION
 Obsolete function. Use \fIcurl_easy_escape(3)\fP instead!
diff --git a/docs/libcurl/curl_unescape.3 b/docs/libcurl/curl_unescape.3
index 8d16852b0e030580bbfdccb53a78bfcc62fafa22..56de9453708a4767e77b5b814d7ba5ce667a7ea3 100644
--- a/docs/libcurl/curl_unescape.3
+++ b/docs/libcurl/curl_unescape.3
@@ -25,7 +25,7 @@ curl_unescape - URL decodes the given string
 .SH SYNOPSIS
 .B #include <curl/curl.h>
 .sp
-.BI "char *curl_unescape( char *" url ", int "length " );"
+.BI "char *curl_unescape( const char *" url ", int "length " );"
 .ad
 .SH DESCRIPTION
 Obsolete function. Use \fIcurl_easy_unescape(3)\fP instead!