diff --git a/include/tlibc/filesystem.h b/include/tlibc/filesystem.h
index d8f1954..74fb2a5 100644
--- a/include/tlibc/filesystem.h
+++ b/include/tlibc/filesystem.h
@@ -31,6 +31,9 @@
     #define path_notseps "\\"
 #endif
 
+// @brief replaces path_notsep with path_sep
+void path_fix_separators(str* path);
+
 /// @brief removes part of path after path_sep (including path_sep)
 /// @return pointer to a segment of path.data or "." if no path_sep has been found
 str path_dirname(str path);
diff --git a/include/tlibc/string/str.h b/include/tlibc/string/str.h
index 69c1b95..c047937 100755
--- a/include/tlibc/string/str.h
+++ b/include/tlibc/string/str.h
@@ -90,6 +90,10 @@ str hex_to_str(Array(u8) buf, bool uppercase);
 void str_trim(str* line, bool set_zero_at_end);
 
 
+/// replaces all occurences of `fragment` in `s` with `replacement`
+void str_replaceChar(str* s, char fragment, char replacement);
+
+
 ///@return s[0..n]
 static inline str str_sliceBefore(str s, u32 n){
     return str_construct(s.data, n, false);
diff --git a/project.config b/project.config
index ddb9a81..a84ab45 100644
--- a/project.config
+++ b/project.config
@@ -35,7 +35,7 @@ OBJDIR="obj"
 OUTDIR="bin"
 STATIC_LIB_FILE="$PROJECT.a"
 
-INCLUDE="-I./include"
+INCLUDE="-Iinclude"
 
 # OS-specific options
 case "$OS" in
diff --git a/src/filesystem/path.c b/src/filesystem/path.c
index 9bce84c..e05b95a 100644
--- a/src/filesystem/path.c
+++ b/src/filesystem/path.c
@@ -6,6 +6,10 @@
 #else
 #endif
 
+void path_fix_separators(str* path){
+    str_replaceChar(path, path_notsep, path_sep);
+}
+
 str path_dirname(str path){
     if(path.len == 0)
         return path;
diff --git a/src/string/str.c b/src/string/str.c
index dbd553f..7c83152 100755
--- a/src/string/str.c
+++ b/src/string/str.c
@@ -175,3 +175,10 @@ void str_trim(str* line, bool set_zero_at_end){
         line->isZeroTerminated = true;
     }
 }
+
+void str_replaceChar(str* s, char fragment, char replacement){
+    for(u32 i = 0; i < s->len; i++){
+        if(s->data[i] == fragment)
+            s->data[i] = replacement;
+    }
+}