diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 91068603e7..4663f56217 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2020-11-20  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* unittests/gmp-utils-selftests.c (gdb_mpz_read_all_from_small):
+	Pass 2.0 to pow.
+	(gdb_mpz_write_all_from_small): Likewise.
+
 2020-11-20  Simon Marchi  <simon.marchi@polymtl.ca>
 
 	* dwarf2/read.c (finish_fixed_point_type): Use std::abs instead
diff --git a/gdb/unittests/gmp-utils-selftests.c b/gdb/unittests/gmp-utils-selftests.c
index e8c3c5c1cb..af5bc65d2f 100644
--- a/gdb/unittests/gmp-utils-selftests.c
+++ b/gdb/unittests/gmp-utils-selftests.c
@@ -125,8 +125,8 @@ gdb_mpz_read_all_from_small ()
      to check the complete range.  */
 
   int buf_len = 1;
-  LONGEST l_min = -pow (2, buf_len * 8 - 1);
-  LONGEST l_max = pow (2, buf_len * 8 - 1) - 1;
+  LONGEST l_min = -pow (2.0, buf_len * 8 - 1);
+  LONGEST l_max = pow (2.0, buf_len * 8 - 1) - 1;
 
   for (LONGEST l = l_min; l <= l_max; l++)
     {
@@ -141,7 +141,7 @@ gdb_mpz_read_all_from_small ()
 
   /* Do the same as above, but with an unsigned type.  */
   ULONGEST ul_min = 0;
-  ULONGEST ul_max = pow (2, buf_len * 8) - 1;
+  ULONGEST ul_max = pow (2.0, buf_len * 8) - 1;
 
   for (ULONGEST ul = ul_min; ul <= ul_max; ul++)
     {
@@ -248,8 +248,8 @@ static void
 gdb_mpz_write_all_from_small ()
 {
   int buf_len = 1;
-  LONGEST l_min = -pow (2, buf_len * 8 - 1);
-  LONGEST l_max = pow (2, buf_len * 8 - 1) - 1;
+  LONGEST l_min = -pow (2.0, buf_len * 8 - 1);
+  LONGEST l_max = pow (2.0, buf_len * 8 - 1) - 1;
 
   for (LONGEST l = l_min; l <= l_max; l++)
     {
@@ -259,7 +259,7 @@ gdb_mpz_write_all_from_small ()
 
     /* Do the same as above, but with an unsigned type.  */
   ULONGEST ul_min = 0;
-  ULONGEST ul_max = pow (2, buf_len * 8) - 1;
+  ULONGEST ul_max = pow (2.0, buf_len * 8) - 1;
 
   for (ULONGEST ul = ul_min; ul <= ul_max; ul++)
     {