diff --git a/classes/sanity-external-toolchain.bbclass b/classes/sanity-external-toolchain.bbclass
index 0f9f6b2..bb07204 100644
--- a/classes/sanity-external-toolchain.bbclass
+++ b/classes/sanity-external-toolchain.bbclass
@@ -31,7 +31,7 @@ def check_toolchain_sanity(d, generate_events=False):
         raise_exttc_sanity_error('Compiler path `%s` does not exist' % gcc, d, generate_events)
 
     # Test 4: we can run it to get the version
-    cmd = d.expand('${EXTERNAL_TOOLCHAIN_BIN}/${EXTERNAL_TARGET_SYS}-gcc -dumpversion')
+    cmd = d.expand('${EXTERNAL_TOOLCHAIN_BIN}/${EXTERNAL_CC} -dumpversion')
     sourcery_version = exttc_sanity_run(shlex.split(cmd), d, generate_events)
     if cfgdata.get('sourcery_version') == sourcery_version:
         return
@@ -48,7 +48,7 @@ def check_toolchain_sanity(d, generate_events=False):
         l.setVar('TOOLCHAIN_OPTIONS', '')
         l.setVar('TARGET_PREFIX', '${EXTERNAL_TARGET_SYS}-')
         l.setVar('HOST_CC_ARCH_remove', '--no-sysroot-suffix')
-        cmd = l.expand('${EXTERNAL_TOOLCHAIN_BIN}/${CC} ${HOST_CC_ARCH} ${CFLAGS} ${LDFLAGS} test.c -o test')
+        cmd = l.expand('${EXTERNAL_TOOLCHAIN_BIN}/${EXTERNAL_CC} ${HOST_CC_ARCH} ${CFLAGS} ${LDFLAGS} test.c -o test')
         exttc_sanity_run(shlex.split(cmd), d, generate_events, tmpdir)
 
     with open(sanity_file, 'w') as f: