diff --git a/GNUmakefile b/GNUmakefile
index 433032064..eadcf13d0 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -339,6 +339,7 @@ TEST_PACKAGES_FAST = \
 	embed/internal/embedtest \
 	encoding \
 	encoding/ascii85 \
+	errors \
 	encoding/asn1 \
 	encoding/base32 \
 	encoding/base64 \
@@ -487,7 +488,7 @@ TEST_PACKAGES_HOST := $(TEST_PACKAGES_FAST) $(TEST_PACKAGES_WINDOWS)
 TEST_IOFS := false
 endif
 
-TEST_SKIP_FLAG := -skip='TestExtraMethods|TestParseAndBytesRoundTrip/P256/Generic|TestParseQueryLimits|TestParseStrictIpv6'
+TEST_SKIP_FLAG := -skip='TestExtraMethods|TestParseAndBytesRoundTrip/P256/Generic|TestParseQueryLimits|TestParseStrictIpv6|TestAsValidation'
 TEST_ADDITIONAL_FLAGS ?=
 
 # Test known-working standard library packages.