diff --git a/extras/soundio/save_raw/save_raw.cpp b/extras/soundio/save_raw/save_raw.cpp
index 1cfbdd6..2594680 100644
--- a/extras/soundio/save_raw/save_raw.cpp
+++ b/extras/soundio/save_raw/save_raw.cpp
@@ -124,7 +124,7 @@ void my_handler(sig_atomic_t i){
         printf("Caught signal %d\n",i);
     } else 
     {
-        cerr << "sig seg fault handler" << endl;
+        std::cerr << "sig seg fault handler" << std::endl;
         const int asize = 10;
         void *array[asize];
         size_t size;
@@ -133,15 +133,15 @@ void my_handler(sig_atomic_t i){
         size = backtrace(array, asize);
 
         // print out all the frames to stderr
-        cerr << "stack trace: " << endl;
+        std::cerr << "stack trace: " << std::endl;
         backtrace_symbols_fd(array, size, STDERR_FILENO);
-        cerr << "resend SIGSEGV to get core dump" << endl;
+        std::cerr << "resend SIGSEGV to get core dump" << std::endl;
         signal(i, SIG_DFL);
         kill(getpid(), i);
     }
 }
 void crash_handler(sig_atomic_t i){
-    cerr << "sig seg fault handler" << endl;
+    std::cerr << "sig seg fault handler" << std::endl;
     const int asize = 10;
     void *array[asize];
     size_t size;
@@ -150,9 +150,9 @@ void crash_handler(sig_atomic_t i){
     size = backtrace(array, asize);
 
     // print out all the frames to stderr
-    cerr << "stack trace: " << endl;
+    std::cerr << "stack trace: " << std::endl;
     backtrace_symbols_fd(array, size, STDERR_FILENO);
-    cerr << "resend SIGSEGV to get core dump" << endl;
+    std::cerr << "resend SIGSEGV to get core dump" << std::endl;
     signal(i, SIG_DFL);
     kill(getpid(), i);
 }
diff --git a/extras/soundio/save_raw_sd/save_raw_sd.cpp b/extras/soundio/save_raw_sd/save_raw_sd.cpp
index 5741e71..b50701b 100644
--- a/extras/soundio/save_raw_sd/save_raw_sd.cpp
+++ b/extras/soundio/save_raw_sd/save_raw_sd.cpp
@@ -133,7 +133,7 @@ void my_handler(sig_atomic_t i){
         printf("Caught signal %d\n",i);
     } else 
     {
-        cerr << "sig seg fault handler" << endl;
+        std::cerr << "sig seg fault handler" << std::endl;
         const int asize = 10;
         void *array[asize];
         size_t size;
@@ -142,15 +142,15 @@ void my_handler(sig_atomic_t i){
         size = backtrace(array, asize);
 
         // print out all the frames to stderr
-        cerr << "stack trace: " << endl;
+        std::cerr << "stack trace: " << std::endl;
         backtrace_symbols_fd(array, size, STDERR_FILENO);
-        cerr << "resend SIGSEGV to get core dump" << endl;
+        std::cerr << "resend SIGSEGV to get core dump" << std::endl;
         signal(i, SIG_DFL);
         kill(getpid(), i);
     }
 }
 void crash_handler(sig_atomic_t i){
-    cerr << "sig seg fault handler" << endl;
+    std::cerr << "sig seg fault handler" << std::endl;
     const int asize = 10;
     void *array[asize];
     size_t size;
@@ -159,9 +159,9 @@ void crash_handler(sig_atomic_t i){
     size = backtrace(array, asize);
 
     // print out all the frames to stderr
-    cerr << "stack trace: " << endl;
+    std::cerr << "stack trace: " << std::endl;
     backtrace_symbols_fd(array, size, STDERR_FILENO);
-    cerr << "resend SIGSEGV to get core dump" << endl;
+    std::cerr << "resend SIGSEGV to get core dump" << std::endl;
     signal(i, SIG_DFL);
     kill(getpid(), i);
 }
diff --git a/extras/soundio/save_wav/save_wav.cpp b/extras/soundio/save_wav/save_wav.cpp
index fb70fdc..8a20eea 100644
--- a/extras/soundio/save_wav/save_wav.cpp
+++ b/extras/soundio/save_wav/save_wav.cpp
@@ -118,7 +118,7 @@ void my_handler(sig_atomic_t i){
         printf("Caught signal %d\n",i);
     } else 
     {
-        cerr << "sig seg fault handler" << endl;
+        std::cerr << "sig seg fault handler" << std::endl;
         const int asize = 10;
         void *array[asize];
         size_t size;
@@ -127,15 +127,15 @@ void my_handler(sig_atomic_t i){
         size = backtrace(array, asize);
 
         // print out all the frames to stderr
-        cerr << "stack trace: " << endl;
+        std::cerr << "stack trace: " << std::endl;
         backtrace_symbols_fd(array, size, STDERR_FILENO);
-        cerr << "resend SIGSEGV to get core dump" << endl;
+        std::cerr << "resend SIGSEGV to get core dump" << std::endl;
         signal(i, SIG_DFL);
         kill(getpid(), i);
     }
 }
 void crash_handler(sig_atomic_t i){
-    cerr << "sig seg fault handler" << endl;
+    std::cerr << "sig seg fault handler" << std::endl;
     const int asize = 10;
     void *array[asize];
     size_t size;
@@ -144,9 +144,9 @@ void crash_handler(sig_atomic_t i){
     size = backtrace(array, asize);
 
     // print out all the frames to stderr
-    cerr << "stack trace: " << endl;
+    std::cerr << "stack trace: " << std::endl;
     backtrace_symbols_fd(array, size, STDERR_FILENO);
-    cerr << "resend SIGSEGV to get core dump" << endl;
+    std::cerr << "resend SIGSEGV to get core dump" << std::endl;
     signal(i, SIG_DFL);
     kill(getpid(), i);
 }
diff --git a/extras/soundio/sd_play_all/sd_play_all.cpp b/extras/soundio/sd_play_all/sd_play_all.cpp
index f8fba59..a3e66de 100644
--- a/extras/soundio/sd_play_all/sd_play_all.cpp
+++ b/extras/soundio/sd_play_all/sd_play_all.cpp
@@ -216,7 +216,7 @@ void my_handler(sig_atomic_t i){
         printf("Caught signal %d\n",i);
     } else 
     {
-        cerr << "sig seg fault handler" << endl;
+        std::cerr << "sig seg fault handler" << std::endl;
         const int asize = 10;
         void *array[asize];
         size_t size;
@@ -225,15 +225,15 @@ void my_handler(sig_atomic_t i){
         size = backtrace(array, asize);
 
         // print out all the frames to stderr
-        cerr << "stack trace: " << endl;
+        std::cerr << "stack trace: " << std::endl;
         backtrace_symbols_fd(array, size, STDERR_FILENO);
-        cerr << "resend SIGSEGV to get core dump" << endl;
+        std::cerr << "resend SIGSEGV to get core dump" << std::endl;
         signal(i, SIG_DFL);
         kill(getpid(), i);
     }
 }
 void crash_handler(sig_atomic_t i){
-    cerr << "sig seg fault handler" << endl;
+    std::cerr << "sig seg fault handler" << std::endl;
     const int asize = 10;
     void *array[asize];
     size_t size;
@@ -242,9 +242,9 @@ void crash_handler(sig_atomic_t i){
     size = backtrace(array, asize);
 
     // print out all the frames to stderr
-    cerr << "stack trace: " << endl;
+    std::cerr << "stack trace: " << std::endl;
     backtrace_symbols_fd(array, size, STDERR_FILENO);
-    cerr << "resend SIGSEGV to get core dump" << endl;
+    std::cerr << "resend SIGSEGV to get core dump" << std::endl;
     signal(i, SIG_DFL);
     kill(getpid(), i);
 }