diff --git a/.gitmodules b/.gitmodules
index 11c8a6c..78cd170 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,6 +1,3 @@
 [submodule "sub/termbox_next"]
 	path = sub/termbox_next
 	url = https://github.com/cylgom/termbox_next
-[submodule "sub/ccommon"]
-	path = sub/ccommon
-	url = https://github.com/lptstr/ccommon
diff --git a/args.h b/args.h
index 490045c..db1dedf 100644
--- a/args.h
+++ b/args.h
@@ -13,12 +13,17 @@
 #define ARGS_INCLUDED
 #include "bool.h"
 #include "args.h"
+
+#ifdef __OpenBSD__
+#include "sys/types.h"
+#else
 #include "types.h"
+#endif
 
 extern char *argv0;
 
 typedef struct Options {
-	usize refresh_rate;
+	size_t refresh_rate;
 	bool truecolor;
 } Options;
 
diff --git a/colors.h b/colors.h
index 3bd8f1a..65d6b06 100644
--- a/colors.h
+++ b/colors.h
@@ -1,10 +1,15 @@
 #ifndef COLORS_INCLUDED
 #define COLORS_INCLUDED
 
-#include "types.h"
 #include "termbox.h"
 #define CLRS_LEN	13
 
+#ifdef __OpenBSD__
+#include "sys/types.h"
+#else
+#include "types.h"
+#endif
+
 #define RED	0xdd1111
 #define BLACK	0x000000
 #define YELLOW	0xff7700
diff --git a/draw.c b/draw.c
index 5a81f51..20eebed 100644
--- a/draw.c
+++ b/draw.c
@@ -4,11 +4,16 @@
 
 #include "args.h"
 #include "termbox.h"
-#include "types.h"
 #include "draw.h"
 #include "colors.h"
 #include "output.h"
 
+#ifdef __OpenBSD__
+#include "sys/types.h"
+#else
+#include "types.h"
+#endif
+
 // arguments
 extern struct Options *opts;
 
@@ -20,8 +25,8 @@ init ( struct buffer *buf )
 	buf->width = tb_width();
 	buf->height = tb_height();
 
-	usize len = buf->width * buf->height;
-	buf->buf = (u8*) malloc(len);
+	size_t len = buf->width * buf->height;
+	buf->buf = (uint8_t*) malloc(len);
 	len -= buf->width;
 
 	if (buf->buf == NULL) {
@@ -42,15 +47,15 @@ init ( struct buffer *buf )
 void
 dofire ( struct buffer *buf )
 {
-	usize src;
-	usize random;
-	usize dest;
+	size_t src;
+	size_t random;
+	size_t dest;
 
 	struct tb_cell *realbuf = tb_cell_buffer();
 
-	for (usize x = 0; x < buf->width; ++x)
+	for (size_t x = 0; x < buf->width; ++x)
 	{
-		for (usize y = 1; y < buf->height; ++y)
+		for (size_t y = 1; y < buf->height; ++y)
 		{
 			src = y * buf->width + x;
 			random = (rand() % 7) & 3;
diff --git a/draw.h b/draw.h
index d91525b..974265e 100644
--- a/draw.h
+++ b/draw.h
@@ -1,14 +1,18 @@
 #ifndef DRAW_INCLUDED
 #define DRAW_INCLUDED
 
+#ifdef __OpenBSD__
+#include "sys/types.h"
+#else
 #include "types.h"
+#endif
 
 typedef struct buffer
 {
-	usize width;
-	usize height;
+    size_t width;
+    size_t height;
 	
-	u8* buf;
+	uint8_t* buf;
 } buffer;
 
 void init ( struct buffer *buf );
diff --git a/main.c b/main.c
index 180deb4..e494e36 100644
--- a/main.c
+++ b/main.c
@@ -3,10 +3,15 @@
 #include "bool.h"
 #include "output.h"
 #include "draw.h"
-#include "types.h"
 #include "termbox.h"
 #include "args.h"
 
+#ifdef __OpenBSD__
+#include "sys/types.h"
+#else
+#include "types.h"
+#endif
+
 #define VERSION	"0.2.0"
 
 // argument parsing (args.h)
@@ -25,7 +30,7 @@ main ( int argc, char *argv[] )
 	// default args
 	opts->refresh_rate = 5;
 	opts->truecolor    = FALSE;
-	usize output_mode  = TB_OUTPUT_NORMAL;
+	size_t output_mode  = TB_OUTPUT_NORMAL;
 
 	// argument parsing
 	argv0 = argv[0];
@@ -75,7 +80,7 @@ main ( int argc, char *argv[] )
 		tb_present();
 
 		// event handling
-		int err = (usize) tb_peek_event(&e, opts->refresh_rate);
+		int err = (size_t) tb_peek_event(&e, opts->refresh_rate);
 
 		if (err < 0)
 			continue;
diff --git a/makefile b/makefile
index 3245e26..7c17d60 100644
--- a/makefile
+++ b/makefile
@@ -8,7 +8,7 @@ NAME	= fire
 WARNING	= -Wall -Wextra -pedantic -Wmissing-prototypes \
 	  -Wold-style-definition -Werror
 
-INC	= -Isub/termbox_next/src -Isub/ccommon/
+INC	= -Isub/termbox_next/src
 
 CC	= gcc
 CFLAGS	= -std=c99 -O3 $(WARNING) $(INC)
diff --git a/sub/ccommon b/sub/ccommon
deleted file mode 160000
index 4a52d51..0000000
--- a/sub/ccommon
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 4a52d5153f63b20691410debdaba619f7923e493
diff --git a/sub/termbox_next b/sub/termbox_next
index 2312da1..7b85905 160000
--- a/sub/termbox_next
+++ b/sub/termbox_next
@@ -1 +1 @@
-Subproject commit 2312da153e44face7bb45aa2798ec284289c17ca
+Subproject commit 7b85905531bf9e5908c67276dac55d3241361f20