diff --git a/main_test.go b/main_test.go
index b3e86420f..6c086e85c 100644
--- a/main_test.go
+++ b/main_test.go
@@ -210,10 +210,6 @@ func runPlatTests(options compileopts.Options, tests []string, t *testing.T) {
 				// limited amount of memory.
 				continue
 
-			case "gc.go":
-				// Does not pass due to high mark false positive rate.
-				continue
-
 			case "json.go", "stdlib.go", "testing.go":
 				// Too big for AVR. Doesn't fit in flash/RAM.
 				continue
diff --git a/targets/avr.json b/targets/avr.json
index 587a3e565..9700f241b 100644
--- a/targets/avr.json
+++ b/targets/avr.json
@@ -3,7 +3,7 @@
 	"build-tags": ["avr", "baremetal", "linux", "arm"],
 	"goos": "linux",
 	"goarch": "arm",
-	"gc": "conservative",
+	"gc": "precise",
 	"linker": "ld.lld",
 	"scheduler": "none",
 	"rtlib": "compiler-rt",