diff --git a/src/client/scanner.c b/src/client/scanner.c
index 10c3278..d5f2d18 100644
--- a/src/client/scanner.c
+++ b/src/client/scanner.c
@@ -33,7 +33,7 @@ static DirEntry* dir_entry_create(const char* path, int depth) {
   return de;
 }
 
-DirectoryScanner* directory_scanner_create(char* root_directory, bool use_metadata,
+DirectoryScanner* directory_scanner_create(const char* root_directory, bool use_metadata,
                                            unsigned long long chunk_size, char** exclude_patterns,
                                            int exclude_count, char** include_patterns,
                                            int include_count, unsigned long long max_size,
diff --git a/src/client/scanner.h b/src/client/scanner.h
index a9e6c0d..7a77a25 100644
--- a/src/client/scanner.h
+++ b/src/client/scanner.h
@@ -22,7 +22,7 @@ typedef struct {
   int current_depth;
 } DirectoryScanner;
 
-DirectoryScanner* directory_scanner_create(char* root_directory, bool use_metadata,
+DirectoryScanner* directory_scanner_create(const char* root_directory, bool use_metadata,
                                            unsigned long long chunk_size, char** exclude_patterns,
                                            int exclude_count, char** include_patterns,
                                            int include_count, unsigned long long max_size,