diff --git a/configure b/configure
index 2685fdcd7b435f..8b91d1d871a971 100755
--- a/configure
+++ b/configure
@@ -15521,7 +15521,7 @@ else case e in #(
 #include <ffi.h>
 int z_is_expected(double complex z)
 {
-    const double complex expected = CMPLX(1.25, -0.5);
+    const double complex expected = 1.25 - 0.5 * I;
     return z == expected;
 }
 int main(void)
diff --git a/configure.ac b/configure.ac
index 55b499faa8d06e..1aedd54bd0c70d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4066,7 +4066,7 @@ AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #include <ffi.h>
 int z_is_expected(double complex z)
 {
-    const double complex expected = CMPLX(1.25, -0.5);
+    const double complex expected = 1.25 - 0.5 * I;
     return z == expected;
 }
 int main(void)