diff --git a/src/cowasm/build.py b/src/cowasm/build.py
index c99bb15d..94cdae3c 100644
--- a/src/cowasm/build.py
+++ b/src/cowasm/build.py
@@ -10,7 +10,7 @@
     toolchain.materialise()
     for arch in ARCHS:
         name = "cowasm-for-" + arch + "-with-" + toolchain.localname
-        items[name] = cowgol(
+        items["bin/" + name] = cowgol(
             name=name,
             toolchain=toolchain,
             srcs=[
diff --git a/src/cowfe/build.py b/src/cowfe/build.py
index 711984e4..769b8137 100644
--- a/src/cowfe/build.py
+++ b/src/cowfe/build.py
@@ -29,7 +29,7 @@
 for toolchain in TOOLCHAINS:
     for arch in ARCHS:
         name = "cowfe-for-" + arch + "-with-" + toolchain.localname
-        items[name] = cowgol(
+        items["bin/" + name] = cowgol(
             name="cowfe-for-" + arch + "-with-" + toolchain.localname,
             toolchain=toolchain,
             srcs=[
diff --git a/src/cowlink/build.py b/src/cowlink/build.py
index 31c9d738..b26d1153 100644
--- a/src/cowlink/build.py
+++ b/src/cowlink/build.py
@@ -32,7 +32,7 @@
 for toolchain in TOOLCHAINS:
     for arch in ARCHS:
         name = "cowlink-for-" + arch + "-with-" + toolchain.localname
-        items[name] = cowgol(
+        items["bin/" + name] = cowgol(
             name="cowlink-for-" + arch + "-with-" + toolchain.localname,
             toolchain=toolchain,
             srcs=[
diff --git a/src/cowwrap/build.py b/src/cowwrap/build.py
index 13f9a5ce..7f80e018 100644
--- a/src/cowwrap/build.py
+++ b/src/cowwrap/build.py
@@ -4,7 +4,7 @@
 items = {}
 for toolchain in TOOLCHAINS:
     name = "cowwrap-with-" + toolchain.localname
-    items[name] = cowgol(
+    items["bin/" + name] = cowgol(
         name=name,
         toolchain=toolchain,
         srcs=[