diff --git a/libc/tinymath/exp10.c b/libc/tinymath/exp10.c
index f80d13963..f42d7d574 100644
--- a/libc/tinymath/exp10.c
+++ b/libc/tinymath/exp10.c
@@ -128,7 +128,7 @@ exp10 (double x)
      Approximate the two components separately.  */
 
   /* s = 2^(k/N), using lookup table.  */
-  uint64_t e = ki << (52 - EXP_TABLE_BITS);
+  uint64_t e = (uint64_t)ki << (52 - EXP_TABLE_BITS);
   uint64_t i = (ki & IndexMask) * 2;
   uint64_t u = __exp_data.tab[i + 1];
   uint64_t sbits = u + e;
diff --git a/third_party/chibicc/test/BUILD.mk b/third_party/chibicc/test/BUILD.mk
index f5a47118f..602d5a6bc 100644
--- a/third_party/chibicc/test/BUILD.mk
+++ b/third_party/chibicc/test/BUILD.mk
@@ -11,6 +11,7 @@
 #   GCC-built chibicc, and a second time with chibicc-built chibicc
 
 ifeq ($(ARCH), x86_64)
+ifneq ($(MODE), dbg)
 
 PKGS += THIRD_PARTY_CHIBICC_TEST
 
@@ -75,6 +76,7 @@ o/$(MODE)/third_party/chibicc/test/%.o:						\
 	@$(COMPILE) -wAOBJECTIFY.c $(CHIBICC) $(CHIBICC_FLAGS) $(OUTPUT_OPTION) -c $<
 
 endif
+endif
 
 .PHONY: o/$(MODE)/third_party/chibicc/test
 o/$(MODE)/third_party/chibicc/test:						\