diff --git a/src/test_grabbag/cuesheet/main.c b/src/test_grabbag/cuesheet/main.c
index 35506f8c..f0cefd23 100644
--- a/src/test_grabbag/cuesheet/main.c
+++ b/src/test_grabbag/cuesheet/main.c
@@ -116,12 +116,12 @@ int main(int argc, char *argv[])
 	const char *usage = "usage: test_cuesheet cuesheet_file lead_out_offset [ [ sample_rate ] cdda ]\n";
 
 	if(argc > 1 && 0 == strcmp(argv[1], "-h")) {
-		printf(usage);
+		printf("%s", usage);
 		return 0;
 	}
 
 	if(argc < 3 || argc > 5) {
-		fprintf(stderr, usage);
+		fprintf(stderr, "%s", usage);
 		return 255;
 	}
 
@@ -132,7 +132,7 @@ int main(int argc, char *argv[])
 			if(0 == strcmp(argv[4], "cdda"))
 				is_cdda = true;
 			else {
-				fprintf(stderr, usage);
+				fprintf(stderr, "%s", usage);
 				return 255;
 			}
 		}
diff --git a/src/test_grabbag/picture/main.c b/src/test_grabbag/picture/main.c
index b59afd13..a1880ae3 100644
--- a/src/test_grabbag/picture/main.c
+++ b/src/test_grabbag/picture/main.c
@@ -211,12 +211,12 @@ int main(int argc, char *argv[])
 	const char *usage = "usage: test_pictures path_prefix\n";
 
 	if(argc > 1 && 0 == strcmp(argv[1], "-h")) {
-		printf(usage);
+		printf("%s", usage);
 		return 0;
 	}
 
 	if(argc != 2) {
-		fprintf(stderr, usage);
+		fprintf(stderr, "%s", usage);
 		return 255;
 	}
 
diff --git a/src/test_seeking/main.c b/src/test_seeking/main.c
index d1f11d6e..589e8596 100644
--- a/src/test_seeking/main.c
+++ b/src/test_seeking/main.c
@@ -418,7 +418,7 @@ int main(int argc, char *argv[])
 	static const char * const usage = "usage: test_seeking file.flac [#seeks] [#samples-in-file.flac] [file.raw]\n";
 
 	if (argc < 2 || argc > 5) {
-		fprintf(stderr, usage);
+		fprintf(stderr, "%s", usage);
 		return 1;
 	}