diff --git a/lib/Makefile.am b/lib/Makefile.am
index c00746d2..a2f24b0c 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -55,7 +55,6 @@ libmu_la_SOURCES=			\
 	mu-maildir.c			\
 	mu-maildir.h			\
 	${crypto}			\
-	mu-msg-crypto.h			\
 	mu-msg-doc.cc			\
 	mu-msg-doc.h			\
 	mu-msg-fields.c			\