diff --git a/Makefile b/Makefile
index d721405..28a6bb6 100644
--- a/Makefile
+++ b/Makefile
@@ -11,7 +11,7 @@ OBJ = $(SRC:.c=.o)
 CC = gcc
 INCLUDE = .
 DEFINE = _GNU_SOURCE
-CFLAGS = -DNDEBUG -g3 -Wextra -Wstrict-prototypes -Wall -ansi -pedantic -I$(INCLUDE)
+CFLAGS = -g3 -Wextra -Wstrict-prototypes -Wall -ansi -pedantic -I$(INCLUDE)
 LIB = -lutil
 RM = rm -f
 
diff --git a/test.c b/test.c
index 29b3d82..ac2ab48 100644
--- a/test.c
+++ b/test.c
@@ -13,6 +13,7 @@ void disp(struct vt100_headless *vt100)
     const char **lines;
 
     lines = vt100_dump(vt100->term);
+    write(1, "\n", 1);
     for (y = 0; y < vt100->term->height; ++y)
     {
         write(1, lines[y], vt100->term->width);
diff --git a/vt100_headless.c b/vt100_headless.c
index eca0513..d899b0f 100644
--- a/vt100_headless.c
+++ b/vt100_headless.c
@@ -45,6 +45,7 @@ static void restore_termios(struct vt100_headless *this, int fd)
 /*     fprintf(stderr, "\n"); */
 /* } */
 
+#ifndef NDEBUG
 static void strdump(char *str)
 {
     while (*str != '\0')
@@ -57,6 +58,7 @@ static void strdump(char *str)
     }
     fprintf(stderr, "\n");
 }
+#endif
 
 static int main_loop(struct vt100_headless *this)
 {
@@ -95,7 +97,9 @@ static int main_loop(struct vt100_headless *this)
                 return EXIT_FAILURE;
             }
             buffer[read_size] = '\0';
+#ifndef NDEBUG
             strdump(buffer);
+#endif
             terminal_read_str(this->term->terminal, buffer);
             this->changed(this);
         }