1 files changed, 8 insertions, 0 deletions
diff --git a/src/byte_source.c b/src/byte_source.c
index ef6bf3bb..c0cb6413 100644
--- a/src/byte_source.c
+++ b/src/byte_source.c
@@ -28,6 +28,7 @@
 #  include <fcntl.h>
 #endif
 
+#include <assert.h>
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
@@ -67,6 +68,9 @@ serd_byte_source_new_function(const SerdReadFunc        read_func,
                               const SerdNode* const     name,
                               const size_t              page_size)
 {
+  assert(read_func);
+  assert(error_func);
+
   if (!page_size) {
     return NULL;
   }
@@ -114,6 +118,8 @@ is_directory(const char* const path)
 SerdByteSource*
 serd_byte_source_new_filename(const char* const path, const size_t page_size)
 {
+  assert(path);
+
   if (page_size == 0 || is_directory(path)) {
     return NULL;
   }
@@ -158,6 +164,8 @@ SerdByteSource*
 serd_byte_source_new_string(const char* const     string,
                             const SerdNode* const name)
 {
+  assert(string);
+
   SerdByteSource* source = (SerdByteSource*)calloc(1, sizeof(SerdByteSource));
 
   source->page_size = 1;