diff --git a/src/zstrformat.cpp b/src/zstrformat.cpp
index 05b31e59a..aae653efe 100644
--- a/src/zstrformat.cpp
+++ b/src/zstrformat.cpp
@@ -699,7 +699,7 @@ fp_begin:
 			{
 				flags |= F_NEGATIVE;
 			}
-			if (expt == INT_MAX)	// inf or nan
+			if (expt == 9999)	// inf or nan
 			{
 				if (*obuff == 'N')
 				{