diff --git a/libsrc/geos/common/Makefile b/libsrc/geos/common/Makefile
index 575d4e1c1..48dce5cc7 100644
--- a/libsrc/geos/common/Makefile
+++ b/libsrc/geos/common/Makefile
@@ -10,7 +10,7 @@
 %.o:	%.s
 	@$(AS) -o $@ $(AFLAGS) $<
 
-C_OBJS	= _afailed.o abort.o perror.o
+C_OBJS	= _afailed.o abort.o perror.o sleep.o
 S_OBJS	= copydata.o memcpy.o memset.o zerobss.o
 
 all: $(C_OBJS) $(S_OBJS)
diff --git a/libsrc/geos/common/sleep.c b/libsrc/geos/common/sleep.c
new file mode 100644
index 000000000..32b9689d0
--- /dev/null
+++ b/libsrc/geos/common/sleep.c
@@ -0,0 +1,23 @@
+/*
+ * sleep.c
+ *
+ * Maciej 'YTM/Elysium' Witkowiak, 15.08.2003
+ *
+ */
+
+#include <geos.h>
+
+unsigned __fastcall__ sleep (unsigned wait)
+{
+    char typ;
+
+    if ( (get_tv()) & TV_NTSC ) {
+	typ = 60;
+    } else {
+	typ = 50;
+    }
+
+    Sleep(wait*typ);
+
+    return 0;
+}