diff --git a/go/build_bootstrap.sh b/go/build_bootstrap.sh
index b38effb..89c08a3 100755
--- a/go/build_bootstrap.sh
+++ b/go/build_bootstrap.sh
@@ -23,6 +23,7 @@ find src -type f \( ! -name '*.go' \
     -a ! -name 'p256_asm_table.bin' \
 \) -print -delete
 find src -type f -name '*_test.go' -print -delete
+find src -type d -name 'testdata' -print0 | xargs -0 rm -vrf
 find src -type d -empty -print -delete
 find pkg -type f -name '*.a' -print -delete
 find pkg -type d -empty -print -delete
diff --git a/go/build_go.sh b/go/build_go.sh
index e8852bd..62664b4 100755
--- a/go/build_go.sh
+++ b/go/build_go.sh
@@ -23,6 +23,7 @@ find src -type f \( ! -name '*.go' \
     -a ! -name 'p256_asm_table.bin' \
 \) -print -delete
 find src -type f -name '*_test.go' -print -delete
+find src -type d -name 'testdata' -print0 | xargs -0 rm -vrf
 find src -type d -empty -print -delete
 find pkg -type f -name '*.a' -print -delete
 find pkg -type d -empty -print -delete
diff --git a/go/build_go19.sh b/go/build_go19.sh
index b4b1849..9bdf422 100755
--- a/go/build_go19.sh
+++ b/go/build_go19.sh
@@ -23,6 +23,7 @@ find src -type f \( ! -name '*.go' \
     -a ! -name 'p256_asm_table.bin' \
 \) -print -delete
 find src -type f -name '*_test.go' -print -delete
+find src -type d -name 'testdata' -print0 | xargs -0 rm -vrf
 find src -type d -empty -print -delete
 find pkg -type f -name '*.a' -print -delete
 find pkg -type d -empty -print -delete