diff --git a/demos/openssl-enc.c b/demos/openssl-enc.c
index daf529b..b94c402 100644
--- a/demos/openssl-enc.c
+++ b/demos/openssl-enc.c
@@ -48,6 +48,9 @@
 #ifndef LTC_RNG_GET_BYTES
 #error Cannot compile this demo; random generator required
 #endif
+#ifndef LTC_MD5
+#error Cannot compile this demo; MD5 required
+#endif
 
 /* OpenSSL by default only runs one hash round */
 #define OPENSSL_ITERATIONS 1
diff --git a/makefile_include.mk b/makefile_include.mk
index 5c34a8e..d493d0e 100644
--- a/makefile_include.mk
+++ b/makefile_include.mk
@@ -108,8 +108,9 @@ THEADERS = $(wildcard testprof/*.h)
 TIMING=timing
 TEST=test
 
-USEFUL_DEMOS=hashsum openssl-enc
-DEMOS=$(USEFUL_DEMOS) ltcrypt small tv_gen sizes constants
+USEFUL_DEMOS=hashsum
+UNBROKEN_DEMOS=$(USEFUL_DEMOS) ltcrypt small tv_gen sizes constants
+DEMOS=$(UNBROKEN_DEMOS) openssl-enc
 
 TIMINGS=demos/timing.o
 TESTS=demos/test.o
@@ -330,7 +331,7 @@ $(TOBJECTS): $(HEADERS) $(THEADERS)
 
 bins: $(USEFUL_DEMOS)
 
-all_test: test tv_gen $(DEMOS)
+all_test: test $(UNBROKEN_DEMOS)
 
 #build the doxy files (requires Doxygen, tetex and patience)
 doxygen doxy docs: