diff --git a/graphics/devil/files/patch-DevIL_src-IL_src_il__jp2.cpp b/graphics/devil/files/patch-DevIL_src-IL_src_il__jp2.cpp
index 664d07fdff1a..2a61a2897c30 100644
--- a/graphics/devil/files/patch-DevIL_src-IL_src_il__jp2.cpp
+++ b/graphics/devil/files/patch-DevIL_src-IL_src_il__jp2.cpp
@@ -1,18 +1,27 @@
 --- DevIL/src-IL/src/il_jp2.cpp.orig	2017-01-01 23:37:37 UTC
 +++ DevIL/src-IL/src/il_jp2.cpp
-@@ -314,13 +314,13 @@ ILboolean iLoadJp2Internal(jas_stream_t	*Stream, ILima
- 
+@@ -313,14 +313,21 @@ ILboolean iLoadJp2Internal(jas_stream_t	*Stream, ILima
+ }
  
  
+-
 -static int iJp2_file_read(jas_stream_obj_t *obj, char *buf, int cnt)
-+static int iJp2_file_read(jas_stream_obj_t *obj, char *buf, unsigned int cnt)
++#if JAS_VERSION_MAJOR >= 3
++static ssize_t iJp2_file_read(jas_stream_obj_t *obj, char *buf, size_t cnt)
++#else
++static int iJp2_file_read(jas_stream_obj_t *obj, char *buf, unsigned long cnt)
++#endif
  {
  	obj;
  	return iread(buf, 1, cnt);
  }
  
 -static int iJp2_file_write(jas_stream_obj_t *obj, char *buf, int cnt)
-+static int iJp2_file_write(jas_stream_obj_t *obj, const char *buf, unsigned int cnt)
++#if JAS_VERSION_MAJOR >= 3
++static ssize_t iJp2_file_write(jas_stream_obj_t *obj, const char *buf, size_t cnt)
++#else
++static int iJp2_file_write(jas_stream_obj_t *obj, const char *buf, unsigned long cnt)
++#endif
  {
  	obj;
  	return iwrite(buf, 1, cnt);