diff --git a/support/testing/conf/busybox-for-old-toolchains.cfg b/support/testing/conf/busybox-for-old-toolchains.cfg
new file mode 100644
index 0000000000..63fa64f51a
--- /dev/null
+++ b/support/testing/conf/busybox-for-old-toolchains.cfg
@@ -0,0 +1 @@
+# CONFIG_USE_BB_CRYPT_YES is not set
diff --git a/support/testing/tests/toolchain/test_external.py b/support/testing/tests/toolchain/test_external.py
index aed3664a02..b3bb961aac 100644
--- a/support/testing/tests/toolchain/test_external.py
+++ b/support/testing/tests/toolchain/test_external.py
@@ -70,8 +70,10 @@ class TestExternalToolchainArmGnu(TestExternalToolchain):
 
 
 class TestExternalToolchainBuildrootMusl(TestExternalToolchain):
+    busybox_fragment = \
+        infra.filepath("conf/busybox-for-old-toolchains.cfg")
     config = BASIC_CONFIG + \
-        """
+        f"""
         BR2_arm=y
         BR2_cortex_a9=y
         BR2_ARM_ENABLE_VFP=y
@@ -83,6 +85,7 @@ class TestExternalToolchainBuildrootMusl(TestExternalToolchain):
         BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_12=y
         BR2_TOOLCHAIN_EXTERNAL_CUSTOM_MUSL=y
         BR2_TOOLCHAIN_EXTERNAL_CXX=y
+        BR2_PACKAGE_BUSYBOX_CONFIG_FRAGMENT_FILES="{busybox_fragment}"
         """
     toolchain_prefix = "arm-linux"
 
@@ -96,8 +99,10 @@ class TestExternalToolchainBuildrootMusl(TestExternalToolchain):
 
 
 class TestExternalToolchainCtngMusl(TestExternalToolchain):
+    busybox_fragment = \
+        infra.filepath("conf/busybox-for-old-toolchains.cfg")
     config = BASIC_CONFIG + \
-        """
+        f"""
         BR2_arm=y
         BR2_cortex_a9=y
         BR2_ARM_ENABLE_VFP=y
@@ -110,6 +115,7 @@ class TestExternalToolchainCtngMusl(TestExternalToolchain):
         BR2_TOOLCHAIN_EXTERNAL_HEADERS_3_10=y
         BR2_TOOLCHAIN_EXTERNAL_CUSTOM_MUSL=y
         BR2_TOOLCHAIN_EXTERNAL_CXX=y
+        BR2_PACKAGE_BUSYBOX_CONFIG_FRAGMENT_FILES="{busybox_fragment}"
         """
     toolchain_prefix = "arm-ctng-linux-musleabihf"
 
@@ -123,8 +129,10 @@ class TestExternalToolchainCtngMusl(TestExternalToolchain):
 
 
 class TestExternalToolchainBuildrootuClibc(TestExternalToolchain):
+    busybox_fragment = \
+        infra.filepath("conf/busybox-for-old-toolchains.cfg")
     config = BASIC_CONFIG + \
-        """
+        f"""
         BR2_arm=y
         BR2_TOOLCHAIN_EXTERNAL=y
         BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y
@@ -135,6 +143,7 @@ class TestExternalToolchainBuildrootuClibc(TestExternalToolchain):
         BR2_TOOLCHAIN_EXTERNAL_LOCALE=y
         # BR2_TOOLCHAIN_EXTERNAL_HAS_THREADS_DEBUG is not set
         BR2_TOOLCHAIN_EXTERNAL_CXX=y
+        BR2_PACKAGE_BUSYBOX_CONFIG_FRAGMENT_FILES="{busybox_fragment}"
         """
     toolchain_prefix = "arm-linux"