diff --git a/libtransmission/Makefile.am b/libtransmission/Makefile.am
index 16a7be58e..ae0b7c47b 100644
--- a/libtransmission/Makefile.am
+++ b/libtransmission/Makefile.am
@@ -31,7 +31,7 @@ libtransmission_a_SOURCES = \
   crypto.c \
   crypto-utils.c \
   crypto-utils-fallback.c \
-  crypto-utils-openssl.c \
+  crypto-utils-@CRYPTO_PKG@.c \
   error.c \
   fdlimit.c \
   file.c \