diff --git a/builder/sizes_test.go b/builder/sizes_test.go
index 0f513cc27c..6a6f8d8fcf 100644
--- a/builder/sizes_test.go
+++ b/builder/sizes_test.go
@@ -75,6 +75,18 @@ func TestBinarySize(t *testing.T) {
 		{target: "microbit", path: "examples/serial", opt: "z"},
 		{target: "wioterminal", path: "examples/pininterrupt", opt: "z"},
 
+		{target: "pico", path: "examples/serial", opt: "z"},
+		{target: "pico", path: "examples/serial", opt: "2"},
+		{target: "pico2", path: "examples/serial", opt: "z"},
+		{target: "pico2", path: "examples/serial", opt: "2"},
+		{target: "esp32c3-generic", path: "examples/serial", opt: "z"},
+		{target: "esp32c3-generic", path: "examples/serial", opt: "2"},
+
+		{target: "cortex-m-qemu", path: "./testdata/size-slice", opt: "z"},
+		{target: "cortex-m-qemu", path: "./testdata/size-slice", opt: "2"},
+		{target: "pico2", path: "./testdata/size-os", opt: "z"},
+		{target: "pico2", path: "./testdata/size-os", opt: "2"},
+
 		{target: "cortex-m-qemu", path: "./testdata/size-corpus", opt: "z"},
 		{target: "cortex-m-qemu", path: "./testdata/size-corpus", opt: "2"},
 		{target: "riscv-qemu", path: "./testdata/size-corpus", opt: "z"},
diff --git a/builder/testdata/binary-size.txt b/builder/testdata/binary-size.txt
index ebf3394095..b5e1676839 100644
--- a/builder/testdata/binary-size.txt
+++ b/builder/testdata/binary-size.txt
@@ -1,8 +1,18 @@
-target        package                opt  code rodata data   bss
-hifive1b      examples/echo          z    4558    402    0  2276
-microbit      examples/serial        z    3001    439    8  2272
-wioterminal   examples/pininterrupt  z    7802   1686  136  7280
-cortex-m-qemu ./testdata/size-corpus z    9907   1301   80  4188
-cortex-m-qemu ./testdata/size-corpus 2   17482    862   72  4188
-riscv-qemu    ./testdata/size-corpus z   17540   1028   88 16660
-riscv-qemu    ./testdata/size-corpus 2   25160    744   80 16644
+target          package                opt  code rodata data   bss
+hifive1b        examples/echo          z    4558    402    0  2276
+microbit        examples/serial        z    3001    439    8  2272
+wioterminal     examples/pininterrupt  z    7802   1686  136  7280
+pico            examples/serial        z    7673   1071  112  5616
+pico            examples/serial        2   16298    862  108  5616
+pico2           examples/serial        z    6468   1172  112  5608
+pico2           examples/serial        2   15925    979  108  5608
+esp32c3-generic examples/serial        z    5864    768    0  8664
+esp32c3-generic examples/serial        2    9888    600    8  8672
+cortex-m-qemu   ./testdata/size-slice  z    3087    793    4  4168
+cortex-m-qemu   ./testdata/size-slice  2    7331    341    4  4168
+pico2           ./testdata/size-os     z    6153   1207  128  5592
+pico2           ./testdata/size-os     2   15240   1016  128  5592
+cortex-m-qemu   ./testdata/size-corpus z    9907   1301   80  4188
+cortex-m-qemu   ./testdata/size-corpus 2   17482    862   72  4188
+riscv-qemu      ./testdata/size-corpus z   17540   1028   88 16660
+riscv-qemu      ./testdata/size-corpus 2   25160    744   80 16644
diff --git a/builder/testdata/size-os/main.go b/builder/testdata/size-os/main.go
new file mode 100644
index 0000000000..f481dc0224
--- /dev/null
+++ b/builder/testdata/size-os/main.go
@@ -0,0 +1,7 @@
+package main
+
+import "os"
+
+func main() {
+	os.Stdout.WriteString("hello\n")
+}
diff --git a/builder/testdata/size-slice/main.go b/builder/testdata/size-slice/main.go
new file mode 100644
index 0000000000..0418348132
--- /dev/null
+++ b/builder/testdata/size-slice/main.go
@@ -0,0 +1,17 @@
+package main
+
+var values = makeValues()
+
+func makeValues() []byte {
+	var values []byte
+	for i := 0; i < 32; i++ {
+		values = append(values, byte(i))
+	}
+	return values
+}
+
+func main() {
+	for _, value := range values {
+		println(value)
+	}
+}