diff --git a/project_euler/Problem 08/sol1.c b/project_euler/Problem 08/sol1.c
index 4404549c..2615648b 100644
--- a/project_euler/Problem 08/sol1.c	
+++ b/project_euler/Problem 08/sol1.c	
@@ -4,7 +4,7 @@
 long long int get_product(FILE *fp, long start_pos, int num_digits)
 {
     char ch = ' ';          /* temporary variable to store character read from file */
-    uint8_t num = 0;        /* temporary variable to store digit read */
+    unsigned char num = 0;  /* temporary variable to store digit read */
     long long int prod = 1; /* product accumulator */
     int count = 0;          /* we use this variable to count number of bytes of file read */
 
diff --git a/project_euler/Problem 08/sol2.c b/project_euler/Problem 08/sol2.c
index 9877b92d..0cb79da5 100644
--- a/project_euler/Problem 08/sol2.c	
+++ b/project_euler/Problem 08/sol2.c	
@@ -1,6 +1,5 @@
 #include <stdio.h>
 #include <stdlib.h>
-#include <stdint.h>
 #include <string.h> /* for memmove */
 
 int main(int argc, char *argv[])
@@ -8,8 +7,8 @@ int main(int argc, char *argv[])
     int position = 0, num_bad_chars = 0;
     int num_digits = 4;
     char ch;
-    uint8_t num, num_prev;
-    uint8_t *buffer = NULL;
+    unsigned char num, num_prev;
+    unsigned char *buffer = NULL;
     long long int prod = 1, max_prod = 0;
 
     /* if second command-line argument is given,