diff --git a/modules/juce_graphics/image_formats/jpglib/jconfig.h b/modules/juce_graphics/image_formats/jpglib/jconfig.h
index 22f61408d2..217ac449a2 100644
--- a/modules/juce_graphics/image_formats/jpglib/jconfig.h
+++ b/modules/juce_graphics/image_formats/jpglib/jconfig.h
@@ -20,7 +20,9 @@
 /* #define const */
 #undef CHAR_IS_UNSIGNED
 #define HAVE_STDDEF_H
-#define HAVE_STDLIB_H
+#ifndef HAVE_STDLIB_H
+ #define HAVE_STDLIB_H
+#endif
 #undef NEED_BSD_STRINGS
 #undef NEED_SYS_TYPES_H
 #undef NEED_FAR_POINTERS	/* we presume a 32-bit flat memory model */