diff --git a/overviewer_core/src/overviewer.h b/overviewer_core/src/overviewer.h
index 8376b4f..b2f6190 100644
--- a/overviewer_core/src/overviewer.h
+++ b/overviewer_core/src/overviewer.h
@@ -31,7 +31,7 @@
 
 // increment this value if you've made a change to the c extension
 // and want to force users to rebuild
-#define OVERVIEWER_EXTENSION_VERSION 85
+#define OVERVIEWER_EXTENSION_VERSION 86
 
 #include <stdbool.h>
 #include <stdint.h>
diff --git a/overviewer_core/src/primitives/overlay-mineral.c b/overviewer_core/src/primitives/overlay-mineral.c
index c151d52..f8bba90 100644
--- a/overviewer_core/src/primitives/overlay-mineral.c
+++ b/overviewer_core/src/primitives/overlay-mineral.c
@@ -111,7 +111,7 @@ overlay_mineral_start(void* data, RenderState* state, PyObject* support) {
 
         for (i = 0; i < minerals_size; i++) {
             PyObject* mineral = PyList_GET_ITEM(opt, i);
-            if (!PyArg_ParseTuple(mineral, "b(bbb)", &(minerals[i].block), &(minerals[i].r), &(minerals[i].g), &(minerals[i].b))) {
+            if (!PyArg_ParseTuple(mineral, "H(bbb)", &(minerals[i].block), &(minerals[i].r), &(minerals[i].g), &(minerals[i].b))) {
                 free(minerals);
                 self->minerals = NULL;
                 return true;