diff --git a/include/psyc/debug.h b/include/psyc/debug.h
index 6ddec4c..986dfc0 100644
--- a/include/psyc/debug.h
+++ b/include/psyc/debug.h
@@ -3,7 +3,7 @@
 
 #ifdef DEBUG
 # include <stdio.h>
-# define PP(args) printf args;
+# define PP(args) printf(args);
 #else
 # define PP(args)
 #endif
@@ -82,18 +82,4 @@
 # define P4(MSG)
 #endif
 
-// ASSERT() unused as yet
-#if DEBUG > 0
-# ifdef STRICT
-#  define ASSERT(NAME,COND,VALUE) { unless (COND) { \
-    PP(("Assertion %s failed in %s: %s\n", NAME, ME, VALUE)); \
-    raise_error("Assertion failed (strict mode).\n"); } }
-# else
-#  define ASSERT(NAME,COND,VALUE) { unless (COND) \
-    PP(("Assertion %s failed in %s: %s\n", NAME, ME, VALUE)); }
-# endif
-#else
-# define ASSERT(NAME,CONDITION,VALUE)
-#endif
-
 #endif // DEBUG_H
diff --git a/include/psyc/lib.h b/include/psyc/lib.h
index 5e22a2c..d04aae2 100644
--- a/include/psyc/lib.h
+++ b/include/psyc/lib.h
@@ -6,6 +6,7 @@
 #include "../psyc.h"
 #include "./debug.h"
 #include <sys/cdefs.h>
+#include <assert.h>
 
 /* perlisms for readability */
 #define unless(COND)    if (!(COND))
diff --git a/src/render.c b/src/render.c
index ac31c70..7da3114 100644
--- a/src/render.c
+++ b/src/render.c
@@ -58,6 +58,9 @@ PSYC_RenderRC PSYC_render(PSYC_Packet *packet, char *buffer, size_t buflen)
 	}
 
 	memcpy(buffer + cur, PSYC_PACKET_DELIMITER + 1, 2);
+	cur += 2;
+
+	assert(cur == packet->length);
 	return PSYC_RENDER_SUCCESS;
 }
 
diff --git a/test/testRender.c b/test/testRender.c
index a2f87a1..657f249 100644
--- a/test/testRender.c
+++ b/test/testRender.c
@@ -12,7 +12,7 @@ int writePresence(const char *avail, int availlen, const char *desc, int desclen
 		PSYC_newModifier2(C_GLYPH_OPERATOR_SET, PSYC_C2ARG("_source"), PSYC_C2ARG(myUNI),
 		                  PSYC_MODIFIER_ROUTING),
 		PSYC_newModifier2(C_GLYPH_OPERATOR_SET, PSYC_C2ARG("_context"), PSYC_C2ARG(myUNI),
-		                  PSYC_MODIFIER_CHECK_LENGTH),
+		                  PSYC_MODIFIER_ROUTING),
 	};
 
 	PSYC_Modifier entity[] = {