diff --git a/example-clients/internal_metro.cpp b/example-clients/internal_metro.cpp
index 7146a7e4..6591ec7c 100644
--- a/example-clients/internal_metro.cpp
+++ b/example-clients/internal_metro.cpp
@@ -48,7 +48,7 @@ InternalMetro::InternalMetro(int freq, double max_amp, int dur_arg, int bpm, cha
     int i, attack_length, decay_length;
     double *amp;
     int attack_percent = 1, decay_percent = 10;
-    char *bpm_string = "bpm";
+    const char *bpm_string = "bpm";
 
     offset = 0;
 
diff --git a/linux/alsa/JackAlsaDriver.cpp b/linux/alsa/JackAlsaDriver.cpp
index 11d696e0..6f13d998 100644
--- a/linux/alsa/JackAlsaDriver.cpp
+++ b/linux/alsa/JackAlsaDriver.cpp
@@ -2494,8 +2494,8 @@ extern "C"
         jack_nframes_t srate = 48000;
         jack_nframes_t frames_per_interrupt = 1024;
         unsigned long user_nperiods = 2;
-        char *playback_pcm_name = "hw:0";
-        char *capture_pcm_name = "hw:0";
+        const char *playback_pcm_name = "hw:0";
+        const char *capture_pcm_name = "hw:0";
         int hw_monitoring = FALSE;
         int hw_metering = FALSE;
         int capture = FALSE;
diff --git a/tests/jack_test.cpp b/tests/jack_test.cpp
index 4eaa3468..d65c4ac0 100644
--- a/tests/jack_test.cpp
+++ b/tests/jack_test.cpp
@@ -469,7 +469,7 @@ int main (int argc, char *argv[])
     jack_status_t status;
     char portname[128] = "port";
     char filename[128] = "framefile.ext";
-    char *nullportname = "";
+    const char *nullportname = "";
     int option_index;
     int opt;
     int a = 0;			// working number for in/out port (PHY)...