diff --git a/Zend/Optimizer/sccp.c b/Zend/Optimizer/sccp.c
index f468273e41d..022c6cf73a3 100644
--- a/Zend/Optimizer/sccp.c
+++ b/Zend/Optimizer/sccp.c
@@ -182,7 +182,8 @@ static void set_value(scdf_ctx *scdf, sccp_ctx *ctx, int var, zval *new) {
 	}
 
 #if ZEND_DEBUG
-	ZEND_ASSERT(zend_is_identical(value, new));
+	ZEND_ASSERT(zend_is_identical(value, new) ||
+		(Z_TYPE_P(value) == IS_DOUBLE && Z_TYPE_P(new) == IS_DOUBLE && isnan(Z_DVAL_P(value)) && isnan(Z_DVAL_P(new))));
 #endif
 }
 
diff --git a/ext/opcache/tests/opt/sccp_036.phpt b/ext/opcache/tests/opt/sccp_036.phpt
new file mode 100644
index 00000000000..ce660ce1aad
--- /dev/null
+++ b/ext/opcache/tests/opt/sccp_036.phpt
@@ -0,0 +1,16 @@
+--TEST--
+SCCP 036: NAN handling
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.optimization_level=-1
+--FILE--
+<?php
+function foo() {
+    $y=NAN;
+    for(;x;)for(;$y=1;);
+}
+?>
+DONE
+--EXPECT--
+DONE