diff --git a/townengine/rendering/quad_element_buffer.h b/townengine/rendering/quad_element_buffer.h
index 4f832ee..617e094 100644
--- a/townengine/rendering/quad_element_buffer.h
+++ b/townengine/rendering/quad_element_buffer.h
@@ -2,6 +2,8 @@
 #ifndef QUAD_ELEMENT_BUFFER_H
 #define QUAD_ELEMENT_BUFFER_H
 
+#include "townengine/util.h"
+
 #include <glad/glad.h>
 
 #include <stddef.h>
@@ -16,12 +18,14 @@ static void bind_quad_element_buffer(void) {
         glGenBuffers(1, &buffer);
         glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, buffer);
         glBufferData(GL_ELEMENT_ARRAY_BUFFER,
-                     QUAD_ELEMENT_BUFFER_LENGTH * 6,
+                     QUAD_ELEMENT_BUFFER_LENGTH * 6 * sizeof(uint16_t),
                      NULL,
                      GL_STATIC_DRAW);
 
         uint16_t *const indices = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER,
                                               GL_WRITE_ONLY);
+        if (!indices)
+            CRY("Quad indices generation", "glMapBuffer() failed");
 
         for (uint16_t i = 0; i < QUAD_ELEMENT_BUFFER_LENGTH; ++i) {
             indices[i * 6 + 0] = (uint16_t)(i * 4 + 0);