diff --git a/unix/alloc.c b/unix/alloc.c
index b2512b20..0e1c77e8 100644
--- a/unix/alloc.c
+++ b/unix/alloc.c
@@ -2,25 +2,23 @@
 #include <string.h>
 #include "uipriv_unix.h"
 
-static GHashTable *allocsizes;			// map[*void]*size_t
-
 void initAlloc(void)
 {
-	allocsizes = g_hash_table_new(g_direct_hash, g_direct_equal);
 }
 
+#define UINT8(p) ((uint8_t *) (p))
+#define PVOID(p) ((void *) (p))
+#define DATA(p) PVOID(UINT8(p) + sizeof (size_t))
+#define BASE(p) PVOID(UINT8(p) - sizeof (size_t))
+#define SIZE(p) ((size_t *) (p))
+
 void *uiAlloc(size_t size)
 {
 	void *out;
-	size_t *s;
 
-	out = g_malloc0(size);
-	if (g_hash_table_lookup(allocsizes, out) != NULL)
-		complain("already have a size for %p in uiAlloc()", out);
-	s = g_new0(size_t, 1);
-	*s = size;
-	g_hash_table_insert(allocsizes, out, s);
-	return out;
+	out = g_malloc0(sizeof (size_t) + size);
+	*SIZE(out) = size;
+	return DATA(out);
 }
 
 void *uiRealloc(void *p, size_t new)
@@ -30,26 +28,16 @@ void *uiRealloc(void *p, size_t new)
 
 	if (p == NULL)
 		return uiAlloc(new);
+	p = BASE(p);
 	out = g_realloc(p, new);
-	s = (size_t *) g_hash_table_lookup(allocsizes, p);
-	if (s == NULL)
-		complain("no size found for %p in uiRealloc()", p);
+	s = SIZE(out);
 	if (new <= *s)
-		memset(((uint8_t *) out) + *s, 0, new - *s);
+		memset(((uint8_t *) DATA(out)) + *s, 0, new - *s);
 	*s = new;
-	g_hash_table_remove(allocsizes, p);
-	g_hash_table_insert(allocsizes, out, s);
-	return out;
+	return DATA(out);
 }
 
 void uiFree(void *p)
 {
-	size_t *s;
-
-	g_free(p);
-	s = (size_t *) g_hash_table_lookup(allocsizes, p);
-	if (s == NULL)
-		complain("no size found for %p in uiFree()", p);
-	g_hash_table_remove(allocsizes, p);
-	g_free(s);
+	g_free(BASE(p));
 }