diff --git a/configure b/configure
index 7a68cc62ab..a92ac6acb7 100755
--- a/configure
+++ b/configure
@@ -5435,12 +5435,11 @@ fi
 check_gas() {
     log "check_gas using '$as' as AS"
     # :vararg is used on aarch64, arm and ppc altivec
-    test_as <<EOF || return 1
+    check_as vararg "
 .macro m n, y:vararg=0
 \n: .int \y
 .endm
-m x
-EOF
+m x" || return 1
     # .altmacro is only used in arm asm
     ! enabled arm || check_as gnu_as ".altmacro"
 }