diff --git a/tests/Makefile b/tests/Makefile
index bc6123d676..c6958733d2 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -44,6 +44,7 @@ EXPECT_NAMES=\
 	stdio/printf_space_pad \
 	stdio/ungetc_multiple \
 	stdio/ungetc_ftell \
+	stdio/fscanf_offby1 \
 	stdlib/a64l \
 	stdlib/alloc \
 	stdlib/atof \
diff --git a/tests/expected/stdio/fscanf_offby1.stderr b/tests/expected/stdio/fscanf_offby1.stderr
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/tests/expected/stdio/fscanf_offby1.stdout b/tests/expected/stdio/fscanf_offby1.stdout
new file mode 100644
index 0000000000..daf724a9e5
--- /dev/null
+++ b/tests/expected/stdio/fscanf_offby1.stdout
@@ -0,0 +1 @@
+1234, 7, 32
diff --git a/tests/stdio/fscanf_offby1.c b/tests/stdio/fscanf_offby1.c
new file mode 100644
index 0000000000..c833935793
--- /dev/null
+++ b/tests/stdio/fscanf_offby1.c
@@ -0,0 +1,8 @@
+//1234 a
+#include <stdio.h>
+int main() {
+        FILE *f = fopen("stdio/fscanf_offby1.c", "r");
+        int x;
+        fscanf(f, "//%d", &x);
+        printf("%d, %ld, %d\n", x, ftell(f), fgetc(f));
+}