diff --git a/dev-debug/systemtap/systemtap-5.1-r1.ebuild b/dev-debug/systemtap/systemtap-5.1-r1.ebuild
index 37bf4f0569efa..9a18eb9519e0f 100644
--- a/dev-debug/systemtap/systemtap-5.1-r1.ebuild
+++ b/dev-debug/systemtap/systemtap-5.1-r1.ebuild
@@ -73,7 +73,8 @@ ERROR_DEBUG_FS="${PN} works best with support for Debug Filesystem (DEBUG_FS) -
 
 DOCS="AUTHORS HACKING NEWS README"
 REQUIRED_USE="${PYTHON_REQUIRED_USE}"
-RESTRICT="!test? ( test )"
+# bug #935333, bug #923597, and so on; needs work to get passing on Gentoo.
+RESTRICT="!test? ( test ) test"
 PATCHES=(
 	"${FILESDIR}/${PN}-3.1-ia64.patch"
 )
diff --git a/dev-debug/systemtap/systemtap-5.2.ebuild b/dev-debug/systemtap/systemtap-5.2.ebuild
index 109764c069e8b..c844b43c840e8 100644
--- a/dev-debug/systemtap/systemtap-5.2.ebuild
+++ b/dev-debug/systemtap/systemtap-5.2.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -73,7 +73,8 @@ ERROR_DEBUG_FS="${PN} works best with support for Debug Filesystem (DEBUG_FS) -
 
 DOCS="AUTHORS HACKING NEWS README"
 REQUIRED_USE="${PYTHON_REQUIRED_USE}"
-RESTRICT="!test? ( test )"
+# bug #935333, bug #923597, and so on; needs work to get passing on Gentoo.
+RESTRICT="!test? ( test ) test"
 PATCHES=(
 	"${FILESDIR}/${PN}-3.1-ia64.patch"
 )
diff --git a/dev-debug/systemtap/systemtap-9999.ebuild b/dev-debug/systemtap/systemtap-9999.ebuild
index 109764c069e8b..c844b43c840e8 100644
--- a/dev-debug/systemtap/systemtap-9999.ebuild
+++ b/dev-debug/systemtap/systemtap-9999.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2024 Gentoo Authors
+# Copyright 1999-2025 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -73,7 +73,8 @@ ERROR_DEBUG_FS="${PN} works best with support for Debug Filesystem (DEBUG_FS) -
 
 DOCS="AUTHORS HACKING NEWS README"
 REQUIRED_USE="${PYTHON_REQUIRED_USE}"
-RESTRICT="!test? ( test )"
+# bug #935333, bug #923597, and so on; needs work to get passing on Gentoo.
+RESTRICT="!test? ( test ) test"
 PATCHES=(
 	"${FILESDIR}/${PN}-3.1-ia64.patch"
 )