diff --git a/libavutil/eval.c b/libavutil/eval.c
index 4126cd7f69..9941ed7060 100644
--- a/libavutil/eval.c
+++ b/libavutil/eval.c
@@ -608,7 +608,7 @@ int main(int argc, char **argv)
         "ceil(123.123)",
         "ceil(-123.123)",
         "sqrt(1764)",
-        "sqrt(-1)",
+        "isnan(sqrt(-1))",
         "not(1)",
         "not(NAN)",
         "not(0)",
diff --git a/tests/ref/fate/eval b/tests/ref/fate/eval
index 0e4844efc5..ef50292024 100644
--- a/tests/ref/fate/eval
+++ b/tests/ref/fate/eval
@@ -136,8 +136,8 @@ Evaluating 'ceil(-123.123)'
 Evaluating 'sqrt(1764)'
 'sqrt(1764)' -> 42.000000
 
-Evaluating 'sqrt(-1)'
-'sqrt(-1)' -> -nan
+Evaluating 'isnan(sqrt(-1))'
+'isnan(sqrt(-1))' -> 1.000000
 
 Evaluating 'not(1)'
 'not(1)' -> 0.000000