diff --git a/overviewer_core/src/composite.c b/overviewer_core/src/composite.c
index 64341fd..2fc1c73 100644
--- a/overviewer_core/src/composite.c
+++ b/overviewer_core/src/composite.c
@@ -62,7 +62,7 @@ imaging_python_to_c(PyObject *obj)
    in these composite functions -- even handles auto-sizing to src! */
 static inline void
 setup_source_destination(Imaging src, Imaging dest,
-                         int *sx, int *sy, int *dx, int *dy, unsigned int *xsize, unsigned int *ysize)
+                         int *sx, int *sy, int *dx, int *dy, int *xsize, int *ysize)
 {
    /* handle negative/zero sizes appropriately */
     if (*xsize <= 0 || *ysize <= 0) {
@@ -99,7 +99,7 @@ setup_source_destination(Imaging src, Imaging dest,
 
 /* convenience alpha_over with 1.0 as overall_alpha */
 inline PyObject* alpha_over(PyObject *dest, PyObject *src, PyObject *mask,
-                            int dx, int dy, unsigned int xsize, unsigned int ysize) {
+                            int dx, int dy, int xsize, int ysize) {
     return alpha_over_full(dest, src, mask, 1.0f, dx, dy, xsize, ysize);
 }
 
@@ -110,7 +110,7 @@ inline PyObject* alpha_over(PyObject *dest, PyObject *src, PyObject *mask,
  */
 inline PyObject *
 alpha_over_full(PyObject *dest, PyObject *src, PyObject *mask, float overall_alpha,
-                int dx, int dy, unsigned int xsize, unsigned int ysize) {
+                int dx, int dy, int xsize, int ysize) {
     /* libImaging handles */
     Imaging imDest, imSrc, imMask;
     /* cached blend properties */
@@ -285,7 +285,7 @@ alpha_over_wrap(PyObject *self, PyObject *args)
 PyObject *
 tint_with_mask(PyObject *dest, unsigned char sr, unsigned char sg,
                unsigned char sb, unsigned char sa,
-               PyObject *mask, int dx, int dy, unsigned int xsize, unsigned int ysize) {
+               PyObject *mask, int dx, int dy, int xsize, int ysize) {
     /* libImaging handles */
     Imaging imDest, imMask;
     /* cached blend properties */
diff --git a/overviewer_core/src/overviewer.h b/overviewer_core/src/overviewer.h
index abc72f0..b7d35c3 100644
--- a/overviewer_core/src/overviewer.h
+++ b/overviewer_core/src/overviewer.h
@@ -49,13 +49,13 @@
 /* in composite.c */
 Imaging imaging_python_to_c(PyObject *obj);
 PyObject *alpha_over(PyObject *dest, PyObject *src, PyObject *mask,
-                     int dx, int dy, unsigned int xsize, unsigned int ysize);
+                     int dx, int dy, int xsize, int ysize);
 PyObject *alpha_over_full(PyObject *dest, PyObject *src, PyObject *mask, float overall_alpha,
-                          int dx, int dy, unsigned int xsize, unsigned int ysize);
+                          int dx, int dy, int xsize, int ysize);
 PyObject *alpha_over_wrap(PyObject *self, PyObject *args);
 PyObject *tint_with_mask(PyObject *dest, unsigned char sr, unsigned char sg,
                          unsigned char sb, unsigned char sa,
-                         PyObject *mask, int dx, int dy, unsigned int xsize, unsigned int ysize);
+                         PyObject *mask, int dx, int dy, int xsize, int ysize);
 PyObject *draw_triangle(PyObject *dest, int inclusive,
                         int x0, int y0,
                         unsigned char r0, unsigned char g0, unsigned char b0,
diff --git a/overviewer_core/src/primitives/base.c b/overviewer_core/src/primitives/base.c
index d3e4303..42ca0a1 100644
--- a/overviewer_core/src/primitives/base.c
+++ b/overviewer_core/src/primitives/base.c
@@ -39,33 +39,33 @@ typedef struct {
  */
 static Biome biome_table[] = {
     /* 0 */
-    {"Ocean", 0.5f, 0.5f},
-    {"Plains", 0.8f, 0.4f},
-    {"Desert", 2.0f, 0.0f},
-    {"Extreme Hills", 0.2f, 0.3f},
-    {"Forest", 0.7f, 0.8f},
+    {"Ocean", 0.5, 0.5},
+    {"Plains", 0.8, 0.4},
+    {"Desert", 2.0, 0.0},
+    {"Extreme Hills", 0.2, 0.3},
+    {"Forest", 0.7, 0.8},
     /* 5 */
-    {"Taiga", 0.05f, 0.8f},
-    {"Swampland", 0.8f, 0.9f},
-    {"River", 0.5f, 0.5f},
-    {"Hell", 2.0f, 0.0f},
-    {"Sky", 0.5f, 0.5f},
+    {"Taiga", 0.05, 0.8},
+    {"Swampland", 0.8, 0.9},
+    {"River", 0.5, 0.5},
+    {"Hell", 2.0, 0.0},
+    {"Sky", 0.5, 0.5},
     /* 10 */
-    {"FrozenOcean", 0.0f, 0.5f},
-    {"FrozenRiver", 0.0f, 0.5f},
-    {"Ice Plains", 0.0f, 0.5f},
-    {"Ice Mountains", 0.0f, 0.5f},
-    {"MushroomIsland", 0.9f, 1.0f},
+    {"FrozenOcean", 0.0, 0.5},
+    {"FrozenRiver", 0.0, 0.5},
+    {"Ice Plains", 0.0, 0.5},
+    {"Ice Mountains", 0.0, 0.5},
+    {"MushroomIsland", 0.9, 1.0},
     /* 15 */
-    {"MushroomIslandShore", 0.9f, 1.0f},
-    {"Beach", 0.8f, 0.4f},
-    {"DesertHills", 2.0f, 0.0f},
-    {"ForestHills", 0.7f, 0.8f},
-    {"TaigaHills", 0.05f, 0.8f},
+    {"MushroomIslandShore", 0.9, 1.0},
+    {"Beach", 0.8, 0.4},
+    {"DesertHills", 2.0, 0.0},
+    {"ForestHills", 0.7, 0.8},
+    {"TaigaHills", 0.05, 0.8},
     /* 20 */
-    {"Extreme Hills Edge", 0.2f, 0.3f},
-    {"Jungle", 2.0f, 0.45f}, /* <-- GUESS, but a good one */
-    {"Jungle Mountains", 2.0f, 0.45f}, /* <-- also a guess */
+    {"Extreme Hills Edge", 0.2, 0.3},
+    {"Jungle", 2.0, 0.45}, /* <-- GUESS, but a good one */
+    {"Jungle Mountains", 2.0, 0.45}, /* <-- also a guess */
 };
 
 #define NUM_BIOMES (sizeof(biome_table) / sizeof(Biome))