diff --git a/examples/composition/composed-benchmark.c b/examples/composition/composed-benchmark.c
index 20319e7d..471d74b9 100644
--- a/examples/composition/composed-benchmark.c
+++ b/examples/composition/composed-benchmark.c
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <assert.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <abt.h>
 #include <margo.h>
 
diff --git a/examples/composition/data-xfer-service.c b/examples/composition/data-xfer-service.c
index 131c0bc1..5fe8b60b 100644
--- a/examples/composition/data-xfer-service.c
+++ b/examples/composition/data-xfer-service.c
@@ -5,6 +5,7 @@
  */
 
 #include <assert.h>
+#include <stdlib.h>
 #include <pthread.h>
 #include "data-xfer-proto.h"
 #include "data-xfer-service.h"
diff --git a/examples/margo-example-client.c b/examples/margo-example-client.c
index 5840e9c7..5703616b 100644
--- a/examples/margo-example-client.c
+++ b/examples/margo-example-client.c
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <assert.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <mercury.h>
 #include <abt.h>
 #include <margo.h>
diff --git a/examples/multiplex/margo-example-mp-client.c b/examples/multiplex/margo-example-mp-client.c
index 67b44ac7..f04f1554 100644
--- a/examples/multiplex/margo-example-mp-client.c
+++ b/examples/multiplex/margo-example-mp-client.c
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <assert.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <abt.h>
 #include <margo.h>
 
diff --git a/examples/multiplex/svc1-client.c b/examples/multiplex/svc1-client.c
index 9a787920..8866846f 100644
--- a/examples/multiplex/svc1-client.c
+++ b/examples/multiplex/svc1-client.c
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <assert.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <abt.h>
 
 #include "svc1-client.h"
diff --git a/examples/multiplex/svc1-server.c b/examples/multiplex/svc1-server.c
index 1562517b..7da661b7 100644
--- a/examples/multiplex/svc1-server.c
+++ b/examples/multiplex/svc1-server.c
@@ -5,6 +5,7 @@
  */
 
 #include <assert.h>
+#include <stdlib.h>
 #include <pthread.h>
 #include "svc1-proto.h"
 #include "svc1-server.h"
diff --git a/examples/multiplex/svc2-client.c b/examples/multiplex/svc2-client.c
index 7a98f463..1598ef80 100644
--- a/examples/multiplex/svc2-client.c
+++ b/examples/multiplex/svc2-client.c
@@ -5,6 +5,7 @@
  */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include <assert.h>
 #include <unistd.h>
 #include <abt.h>
diff --git a/examples/multiplex/svc2-server.c b/examples/multiplex/svc2-server.c
index 92d3b2f2..212e679f 100644
--- a/examples/multiplex/svc2-server.c
+++ b/examples/multiplex/svc2-server.c
@@ -5,6 +5,7 @@
  */
 
 #include <assert.h>
+#include <stdlib.h>
 #include <pthread.h>
 #include "svc2-proto.h"
 #include "svc2-server.h"
diff --git a/examples/my-rpc.c b/examples/my-rpc.c
index 23953e19..d9bfca83 100644
--- a/examples/my-rpc.c
+++ b/examples/my-rpc.c
@@ -4,6 +4,7 @@
  * See COPYRIGHT in top-level directory.
  */
 
+#include <stdlib.h>
 #include <assert.h>
 #include "my-rpc.h"
 
diff --git a/src/abtx_prof.h b/src/abtx_prof.h
index 9d7c2a26..a6f6d7b3 100644
--- a/src/abtx_prof.h
+++ b/src/abtx_prof.h
@@ -131,6 +131,7 @@
 #define ABTX_PROF_H_INCLUDED
 
 #include <stdio.h>
+#include <stdlib.h>
 
 #define ABTX_PROF_MODE_BASIC 0
 #define ABTX_PROF_MODE_DETAILED 1
diff --git a/src/margo-bulk-pool.c b/src/margo-bulk-pool.c
index 02dba43c..78a0cd1b 100644
--- a/src/margo-bulk-pool.c
+++ b/src/margo-bulk-pool.c
@@ -7,6 +7,7 @@
 #include <assert.h>
 #include <unistd.h>
 #include <errno.h>
+#include <stdlib.h>
 #include <abt.h>
 
 #include "margo.h"
diff --git a/tests/margo-test-client-error.c b/tests/margo-test-client-error.c
index bd7609a3..e233ed7a 100644
--- a/tests/margo-test-client-error.c
+++ b/tests/margo-test-client-error.c
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <assert.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <mercury.h>
 #include <abt.h>
 #include <margo.h>
diff --git a/tests/margo-test-client-timeout.c b/tests/margo-test-client-timeout.c
index f72acea4..3e686b97 100644
--- a/tests/margo-test-client-timeout.c
+++ b/tests/margo-test-client-timeout.c
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <assert.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <mercury.h>
 #include <abt.h>
 #include <margo.h>
diff --git a/tests/margo-test-client.c b/tests/margo-test-client.c
index 73786ff9..4094859d 100644
--- a/tests/margo-test-client.c
+++ b/tests/margo-test-client.c
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <assert.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <mercury.h>
 #include <abt.h>
 #include <margo.h>
diff --git a/tests/margo-test-server.c b/tests/margo-test-server.c
index 7dc0b471..3fd4a7fe 100644
--- a/tests/margo-test-server.c
+++ b/tests/margo-test-server.c
@@ -7,6 +7,7 @@
 #include <stdio.h>
 #include <assert.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <mercury.h>
 #include <abt.h>
 #include <margo.h>
diff --git a/tests/my-rpc.c b/tests/my-rpc.c
index 3f872eb2..81cbe45b 100644
--- a/tests/my-rpc.c
+++ b/tests/my-rpc.c
@@ -4,6 +4,7 @@
  * See COPYRIGHT in top-level directory.
  */
 
+#include <stdlib.h>
 #include <assert.h>
 #include "my-rpc.h"
 
diff --git a/tests/unit-tests/helper-server.c b/tests/unit-tests/helper-server.c
index ce23ea1e..5d1a9b60 100644
--- a/tests/unit-tests/helper-server.c
+++ b/tests/unit-tests/helper-server.c
@@ -6,6 +6,7 @@
 #include "helper-server.h"
 #include <unistd.h>
 #include <signal.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <sys/wait.h>