diff --git a/tests/suites/test_suite_platform_printf.data b/tests/suites/test_suite_platform_printf.data
index 4be2f68..891771b 100644
--- a/tests/suites/test_suite_platform_printf.data
+++ b/tests/suites/test_suite_platform_printf.data
@@ -74,6 +74,9 @@
 printf "%c%c", COLON, SPACE
 printf_char2:"%c%c":COLON_CHAR:SPACE_CHAR:"\: "
 
+printf "%c%c", QUESTION, SPACE
+printf_char2:"%c%c":QUESTION_CHAR:SPACE_CHAR:"? "
+
 printf "%c%c", BACKSLASH, SPACE
 printf_char2:"%c%c":BACKSLASH_CHAR:SPACE_CHAR:"\\ "
 
@@ -86,6 +89,12 @@
 printf "%c%c", COLON, NEWLINE
 printf_char2:"%c%c":COLON_CHAR:NEWLINE_CHAR:"\:\n"
 
+printf "%c%c", QUESTION, QUESTION
+printf_char2:"%c%c":QUESTION_CHAR:QUESTION_CHAR:"??"
+
+printf "%c%c", QUESTION, NEWLINE
+printf_char2:"%c%c":QUESTION_CHAR:NEWLINE_CHAR:"?\n"
+
 printf "%c%c", BACKSLASH, NEWLINE
 printf_char2:"%c%c":BACKSLASH_CHAR:NEWLINE_CHAR:"\\\n"
 
@@ -95,6 +104,9 @@
 printf "%c%c", BACKSLASH, COLON
 printf_char2:"%c%c":BACKSLASH_CHAR:COLON_CHAR:"\\\:"
 
+printf "%c%c", BACKSLASH, QUESTION
+printf_char2:"%c%c":BACKSLASH_CHAR:QUESTION_CHAR:"\\?"
+
 printf "%c%c", BACKSLASH, BACKSLASH
 printf_char2:"%c%c":BACKSLASH_CHAR:BACKSLASH_CHAR:"\\\\"
 
diff --git a/tests/suites/test_suite_platform_printf.function b/tests/suites/test_suite_platform_printf.function
index 1dd6ae5..3c816fe 100644
--- a/tests/suites/test_suite_platform_printf.function
+++ b/tests/suites/test_suite_platform_printf.function
@@ -19,6 +19,7 @@
 #define SPACE_CHAR ' '
 #define DOUBLE_QUOTE_CHAR '"'
 #define COLON_CHAR ':'
+#define QUESTION_CHAR '?'
 #define BACKSLASH_CHAR '\\'
 #define LOWERCASE_N_CHAR 'n'
 /* END_HEADER */