Index: ngrep-code-16ba99a863a89dab25cbf8e9ca410b19a7494c42/ngrep.c
===================================================================
--- ngrep-code-16ba99a863a89dab25cbf8e9ca410b19a7494c42/ngrep.c
+++ ngrep-code-16ba99a863a89dab25cbf8e9ca410b19a7494c42/ngrep.c
@@ -1005,13 +1005,13 @@ void dump_byline(unsigned char *data, ui
 
         while (s < data + len) {
             if (should_hilite && s == hilite_start)
-                printf(ANSI_hilite);
+                printf("%s", ANSI_hilite);
 
             printf("%c", (*s == '\n' || isprint(*s)) ? *s : nonprint_char);
             s++;
 
             if (should_hilite && s == hilite_end)
-                printf(ANSI_off);
+                printf("%s", ANSI_off);
         }
 
         printf("\n");
@@ -1027,13 +1027,13 @@ void dump_unwrapped(unsigned char *data,
 
         while (s < data + len) {
             if (should_hilite && s == hilite_start)
-                printf(ANSI_hilite);
+                printf("%s", ANSI_hilite);
 
             printf("%c", isprint(*s) ? *s : nonprint_char);
             s++;
 
             if (should_hilite && s == hilite_end)
-                printf(ANSI_off);
+                printf("%s", ANSI_off);
         }
 
         printf("\n");
@@ -1056,7 +1056,7 @@ void dump_formatted(unsigned char *data,
                 for (j = 0; j < width; j++) {
                     if (should_hilite && (mindex <= (i+j) && (i+j) < mindex + msize)) {
                         hiliting = 1;
-                        printf(ANSI_hilite);
+                        printf("%s", ANSI_hilite);
                     }
 
                     if (i + j < len)
@@ -1068,7 +1068,7 @@ void dump_formatted(unsigned char *data,
 
                     if (hiliting) {
                         hiliting = 0;
-                        printf(ANSI_off);
+                        printf("%s", ANSI_off);
                     }
                 }
             }
@@ -1076,7 +1076,7 @@ void dump_formatted(unsigned char *data,
             for (j = 0; j < width; j++) {
                 if (should_hilite && mindex <= (i+j) && (i+j) < mindex + msize) {
                     hiliting = 1;
-                    printf(ANSI_hilite);
+                    printf("%s", ANSI_hilite);
                 }
 
                 if (i + j < len)
@@ -1085,7 +1085,7 @@ void dump_formatted(unsigned char *data,
 
                 if (hiliting) {
                     hiliting = 0;
-                    printf(ANSI_off);
+                    printf("%s", ANSI_off);
                 }
             }