diff --git a/src/Psalm/Type/Atomic/TLiteralFloat.php b/src/Psalm/Type/Atomic/TLiteralFloat.php
index 766d5511eba..754c9bd19bd 100644
--- a/src/Psalm/Type/Atomic/TLiteralFloat.php
+++ b/src/Psalm/Type/Atomic/TLiteralFloat.php
@@ -6,6 +6,8 @@
 
 use Override;
 
+use function is_nan;
+
 /**
  * Denotes a floating point value where the exact numeric value is known.
  *