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-rw-r--r--runtime/klee-libc/putchar.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/runtime/klee-libc/putchar.c b/runtime/klee-libc/putchar.c
index f3fcf01d..4c3a57e4 100644
--- a/runtime/klee-libc/putchar.c
+++ b/runtime/klee-libc/putchar.c
@@ -10,6 +10,9 @@
 #include <stdio.h>
 #include <unistd.h>
 
+// Some header may #define putchar.
+#undef putchar
+
 int putchar(int c) {
   char x = c;
   write(1, &x, 1);