diff --git a/modules/libpr0n/src/Makefile.in b/modules/libpr0n/src/Makefile.in
index 73fee9a6acb8..62cce2d17d2d 100644
--- a/modules/libpr0n/src/Makefile.in
+++ b/modules/libpr0n/src/Makefile.in
@@ -31,7 +31,7 @@ LIBRARY_NAME	= imglib2
 EXPORT_LIBRARY = 1
 IS_COMPONENT	= 1
 
-REQUIRES	= xpcom string necko nkcache layout timer gfx2
+REQUIRES	= xpcom string necko nkcache layout timer gfx2 mimetype
 
 CPPSRCS		= \
 			ImageFactory.cpp \