diff --git a/defs.bzl b/defs.bzl
index 40aba062a..679937c3a 100644
--- a/defs.bzl
+++ b/defs.bzl
@@ -3,6 +3,7 @@
 # defs.bzl - Definitions for Facebook-specific buck build integration
 # in TARGETS
 
+load("@fbcode_macros//build_defs:coverage.bzl", "coverage")
 load("@fbcode_macros//build_defs:cpp_binary.bzl", "cpp_binary")
 load("@fbcode_macros//build_defs:custom_unittest.bzl", "custom_unittest")
 
@@ -37,9 +38,19 @@ def test_binary(
 
     binary_path = "$(location :{})".format(test_bin)
 
+    base_path = native.package_name()
+    tags = []
+    if coverage.is_coverage_enabled(base_path):
+        # This tag instructs testpilot to use
+        # the lower-memory coverage runner
+        # (e.g. it tells testpilot that the binary
+        # is actually instrumented with coverage info)
+        tags = ["coverage"]
+
     custom_unittest(
         name = test_name,
         command = [TEST_RUNNER, binary_path],
         type = ttype,
         env = {"BUCK_BASE_BINARY": binary_path},
+        tags = tags,
     )