diff --git a/tests/contrib/non-blocking/overlap.c b/tests/contrib/non-blocking/overlap.c
index 3f4b120..245cf38 100644
--- a/tests/contrib/non-blocking/overlap.c
+++ b/tests/contrib/non-blocking/overlap.c
@@ -37,6 +37,7 @@
 #include <unistd.h>
 #include <math.h>
 #include <sys/time.h>
+#include <time.h>
 #include <string.h>
 #include <assert.h>
 
diff --git a/tests/mpi/test_mpi_accs.c b/tests/mpi/test_mpi_accs.c
index 730a632..abe54a8 100644
--- a/tests/mpi/test_mpi_accs.c
+++ b/tests/mpi/test_mpi_accs.c
@@ -4,6 +4,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <math.h>
 #include <mpi.h>
 
 #define XDIM 1024 
diff --git a/tests/mpi/test_mpi_indexed_accs.c b/tests/mpi/test_mpi_indexed_accs.c
index 0fc3baa..d6ba13b 100644
--- a/tests/mpi/test_mpi_indexed_accs.c
+++ b/tests/mpi/test_mpi_indexed_accs.c
@@ -15,6 +15,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <math.h>
 #include <mpi.h>
 
 #define XDIM 16
diff --git a/tests/mpi/test_mpi_indexed_gets.c b/tests/mpi/test_mpi_indexed_gets.c
index 19c6158..d11da41 100644
--- a/tests/mpi/test_mpi_indexed_gets.c
+++ b/tests/mpi/test_mpi_indexed_gets.c
@@ -15,6 +15,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <math.h>
 #include <mpi.h>
 
 #define XDIM 8
diff --git a/tests/mpi/test_mpi_indexed_puts_gets.c b/tests/mpi/test_mpi_indexed_puts_gets.c
index ea791dd..e2431e6 100644
--- a/tests/mpi/test_mpi_indexed_puts_gets.c
+++ b/tests/mpi/test_mpi_indexed_puts_gets.c
@@ -15,6 +15,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <math.h>
 #include <mpi.h>
 
 #define XDIM 8
diff --git a/tests/mpi/test_mpi_subarray_accs.c b/tests/mpi/test_mpi_subarray_accs.c
index ddc4b4f..085e18a 100644
--- a/tests/mpi/test_mpi_subarray_accs.c
+++ b/tests/mpi/test_mpi_subarray_accs.c
@@ -15,6 +15,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <math.h>
 #include <mpi.h>
 
 #define XDIM 1024