diff --git a/src/util/string.c b/src/util/string.c
index 4a4f687e9..05bdc2864 100644
--- a/src/util/string.c
+++ b/src/util/string.c
@@ -699,3 +699,9 @@ free_ecmascript_string_list(LIST_OF(struct ecmascript_string_list_item) *list)
 		mem_free(item);
 	}
 }
+
+int
+elinks_isspace(int c)
+{
+	return c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r' || c == ' ';
+}
diff --git a/src/util/string.h b/src/util/string.h
index eaa505fd3..da57d9efc 100644
--- a/src/util/string.h
+++ b/src/util/string.h
@@ -124,6 +124,10 @@ char * c_strcasestr(const char *haystack, const char *needle);
 
 /** @} */
 
+int elinks_isspace(int c);
+
+#undef isspace
+#define isspace elinks_isspace
 
 #define skip_space(S) \
 	do { while (isspace((unsigned char)*(S))) (S)++; } while (0)