diff --git a/tests/stdio_test.cpp b/tests/stdio_test.cpp
index e9ec499..479fd9d 100644
--- a/tests/stdio_test.cpp
+++ b/tests/stdio_test.cpp
@@ -761,7 +761,7 @@
   snprintf(buf, sizeof(buf), "%e", 1.5);
   EXPECT_STREQ("1.500000e+00", buf);
 
-  snprintf(buf, sizeof(buf), "%Le", 1.5l);
+  snprintf(buf, sizeof(buf), "%Le", 1.5L);
   EXPECT_STREQ("1.500000e+00", buf);
 }