diff --git a/platforms/IIgs/build.sh b/platforms/IIgs/build.sh
index 0938e74..f92bcb8 100755
--- a/platforms/IIgs/build.sh
+++ b/platforms/IIgs/build.sh
@@ -1,6 +1,7 @@
 #!/bin/bash
 ACMD=~/bin/AppleCommander-ac-1.5.0.jar
 set -e -x
+cd $(dirname $0)
 ca65 -I ../../inc IIgs.s -l IIgs.lst
 ../../build.sh IIgs
 ld65 -C IIgs.l -S 0x8000 IIgs.o ../../forth.o -m forth.map -o forth
diff --git a/platforms/Neon816/build.sh b/platforms/Neon816/build.sh
index 61f2116..71d79ae 100755
--- a/platforms/Neon816/build.sh
+++ b/platforms/Neon816/build.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
 set -e -x
+cd $(dirname $0)
 ca65 -I ../../inc Neon816.s -l Neon816.lst
 ca65 -I ../../inc romboot.s -l romboot.lst
 ../../build.sh Neon816
diff --git a/platforms/W65C816SXB/build.sh b/platforms/W65C816SXB/build.sh
index 8fffa96..6ff03e7 100755
--- a/platforms/W65C816SXB/build.sh
+++ b/platforms/W65C816SXB/build.sh
@@ -1,5 +1,6 @@
 #!/bin/bash
 set -e -x
+cd $(dirname $0)
 toke fcode/romloader.fs
 ruby mkromfs.rb romfs fs/*
 ca65 -I ../../inc W65C816SXB.s -l W65C816SXB.lst