diff --git a/test/misc/Makefile b/test/misc/Makefile
index bd4826d54..853e9d1e0 100644
--- a/test/misc/Makefile
+++ b/test/misc/Makefile
@@ -117,6 +117,14 @@ $(WORKDIR)/endless.$1.$2.prg: endless.c | $(WORKDIR)
 	$(LD65) -t sim$2 -o $$@ $$(@:.prg=.o) sim$2.lib $(NULLERR)
 	$(NOT) $(SIM65) $(SIM65FLAGS) $$@ $(NULLOUT) $(NULLERR)
 
+# this one fails when optimization are enabled
+$(WORKDIR)/bug1348.$1.$2.prg: bug1348.c | $(WORKDIR)
+	$(if $(QUIET),echo misc/bug1348.$1.$2.prg)
+	$(CC65) -Osr -t sim$2 -$1 -o $$(@:.prg=.s) $$< $(NULLERR)
+	$(CA65) -t sim$2 -o $$(@:.prg=.o) $$(@:.prg=.s) $(NULLERR)
+	$(LD65) -t sim$2 -o $$@ $$(@:.prg=.o) sim$2.lib $(NULLERR)
+	$(NOT) $(SIM65) $(SIM65FLAGS) $$@ $(NULLOUT) $(NULLERR)
+	
 # these need reference data that can't be generated by a host-compiled program,
 # in a useful way
 $(WORKDIR)/limits.$1.$2.prg: limits.c $(ISEQUAL) | $(WORKDIR)
diff --git a/test/misc/bug1348.c b/test/misc/bug1348.c
new file mode 100644
index 000000000..913849482
--- /dev/null
+++ b/test/misc/bug1348.c
@@ -0,0 +1,54 @@
+
+/* bug#1348, wrongly optimized integer promotion in comparison */
+
+#include <stdio.h>
+
+int notrandtab[] = {
+    0xffff, 0x7fff, 0x3fff, 0x1fff,
+    0x0fff, 0x07ff, 0x03ff, 0x01ff,
+    0x00ff, 0x007f, 0x003f, 0x001f,
+    0x000f, 0x0007, 0x0003, 0x0001
+};
+
+unsigned char notrandcount = 0;
+
+int notrand(void)
+{
+    return notrandtab[notrandcount & 0x0f];
+}
+
+unsigned char n1, n2;
+unsigned char i, ii, s;
+unsigned char err = 0;
+
+unsigned char cmptab[] = {
+    0xff, 0x7f, 0x3f, 0x1f,
+    0x0f, 0x07, 0x03, 0x01,
+    0x80, 0x40, 0x20, 0x10,
+    0x08, 0x04, 0x02, 0x01
+};
+
+int main(void)
+{
+    for (ii = 0; ii < 16; ++ii) {
+        s = cmptab[ii];
+        for (i = 0; i < 16; ++i) {
+            n1 = n2 = 0;
+            if ((notrand() & 0xff) > s) {
+                n1 = 1;
+            }
+            if ((notrand() & 0xffu) > s) {
+                n2 = 1;
+            }
+            printf("%5d>%3d %d(%02x) %d(%02x)  %s\n",
+                   notrandtab[notrandcount & 0x0f], s,
+                   n1, (notrand() & 0xff),
+                   n2, (notrand() & 0xffu),
+                   n1 == n2 ? "=" : "!="
+                  );
+            if (n1 != n2) err = 1;
+            notrandcount++;
+        }
+    }
+    return err;
+}