diff --git a/test/format-test.cc b/test/format-test.cc
index 7d4b12e0..36798b39 100644
--- a/test/format-test.cc
+++ b/test/format-test.cc
@@ -1215,7 +1215,9 @@ TEST(FormatterTest, FormatDouble) {
   SPrintf(buffer, "%E", 392.65);
   EXPECT_EQ(buffer, str(Format("{0:E}") << 392.65));
   EXPECT_EQ("+0000392.6", str(Format("{0:+010.4g}") << 392.65));
+  SPrintf(buffer, "%a", -42);
   EXPECT_EQ("-0x1.5p+5", str(Format("{:a}") << -42.0));
+  SPrintf(buffer, "%A", -42);
   EXPECT_EQ("-0X1.5P+5", str(Format("{:A}") << -42.0));
 }
 
diff --git a/test/printf-test.cc b/test/printf-test.cc
index 35878e39..b37f8d63 100644
--- a/test/printf-test.cc
+++ b/test/printf-test.cc
@@ -210,8 +210,10 @@ TEST(PrintfTest, HashFlag) {
   EXPECT_PRINTF("-42.0000", "%#g", -42.0);
   EXPECT_PRINTF("-42.0000", "%#G", -42.0);
 
-  EXPECT_PRINTF("0x1.p+4", "%#a", 16.0);
-  EXPECT_PRINTF("0X1.P+4", "%#A", 16.0);
+  SPrintf(buffer, "%#a", 16.0);
+  EXPECT_PRINTF(buffer, "%#a", 16.0);
+  SPrintf(buffer, "%#A", 16.0);
+  EXPECT_PRINTF(buffer, "%#A", 16.0);
 
   // '#' flag is ignored for non-numeric types.
   EXPECT_PRINTF("x", "%#c", 'x');