diff --git a/tests/spawnanytest.c b/tests/spawnanytest.c
index af8d1f9..a60f0d2 100644
--- a/tests/spawnanytest.c
+++ b/tests/spawnanytest.c
@@ -10,7 +10,7 @@
 int
 main(int argc, const char *argv[])
 {
-    char *program;
+    const char *program;
     int pid[10];
     int status;
 
diff --git a/tests/spawnmultipletest.c b/tests/spawnmultipletest.c
index 8ac5da5..cfbb35c 100644
--- a/tests/spawnmultipletest.c
+++ b/tests/spawnmultipletest.c
@@ -11,7 +11,7 @@ int
 main(int argc, const char *argv[])
 {
     int origpid[10], pid[10];
-    char *program;
+    const char *program;
     int status;
 
     printf("Spawn parallel test wait any: ");
diff --git a/tests/spawnsingletest.c b/tests/spawnsingletest.c
index f4dc097..46c3332 100644
--- a/tests/spawnsingletest.c
+++ b/tests/spawnsingletest.c
@@ -11,7 +11,7 @@ int
 main(int argc, const char *argv[])
 {
     int origpid, pid;
-    char *program;
+    const char *program;
     int status;
 
     printf("Spawn parallel test wait any: ");