diff --git a/.gitignore b/.gitignore
index b2137d6..e6533b4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -28,5 +28,6 @@ stamp-h1
 *.pc
 /src/jansson_config.h
 /jansson_private_config.h.in
+/jansson_private_config.h
 /build
 *.exe
diff --git a/src/value.c b/src/value.c
index 644bc87..438a4de 100644
--- a/src/value.c
+++ b/src/value.c
@@ -29,8 +29,10 @@
 
 /* Work around nonstandard isnan() and isinf() implementations */
 #ifndef isnan
+#ifndef sun
 static JSON_INLINE int isnan(double x) { return x != x; }
 #endif
+#endif
 #ifndef isinf
 static JSON_INLINE int isinf(double x) { return !isnan(x) && isnan(x - x); }
 #endif