diff --git a/src/Makefile.am b/src/Makefile.am
index 58b954669e257c618a899c19b75639f125d0fc44..cbdbfc1a0ecb8180618c1356d87fb3c1d52aa52c 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -52,7 +52,7 @@ include_HEADERS = space.h runner.h queue.h task.h lock.h cell.h part.h const.h \
     chemistry.h chemistry_io.h chemistry_struct.h cosmology.h restart.h space_getsid.h utilities.h \
     mesh_gravity.h cbrt.h exp10.h velociraptor_interface.h swift_velociraptor_part.h outputlist.h \
     logger_io.h tracers_io.h tracers.h tracers_struct.h star_formation_io.h fof.h fof_struct.h fof_io.h \
-    multipole.h multipole_accept.h multipole_struct.h binomial.h \
+    multipole.h multipole_accept.h multipole_struct.h binomial.h integer_power.h \
     star_formation_struct.h star_formation.h star_formation_iact.h \
     star_formation_logger.h star_formation_logger_struct.h \
     pressure_floor.h pressure_floor_struct.h pressure_floor_iact.h \
diff --git a/src/integer_power.h b/src/integer_power.h
new file mode 100644
index 0000000000000000000000000000000000000000..3c4003ddedf333c3d9214cbbb6ae4c37e20cee95
--- /dev/null
+++ b/src/integer_power.h
@@ -0,0 +1,119 @@
+/*******************************************************************************
+ * This file is part of SWIFT.
+ * Copyright (c) 2020  Matthieu Schaller (schaller@strw.leidenuniv.nl)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ ******************************************************************************/
+#ifndef SWIFT_INTEGER_POWER_H
+#define SWIFT_INTEGER_POWER_H
+
+/* Config parameters. */
+#include "../config.h"
+
+/* Local headers */
+#include "error.h"
+#include "inline.h"
+
+/**
+ * @brief Computes the power of x to the n for a (small) positive integer n.
+ *
+ * Only valid for values 0 <= n <= 8.
+ */
+__attribute__((const)) INLINE static int integer_pow(const double x,
+                                                     const unsigned int n) {
+
+#ifdef SWIFT_DEBUG_CHECKS
+  assert(n <= 8);
+#endif
+
+  switch (n) {
+    case 0:
+      return 1.;
+    case 1:
+      return x;
+    case 2:
+      return x * x;
+    case 3:
+      return x * x * x;
+    case 4: {
+      const double y = x * x;
+      return y * y;
+    }
+    case 5: {
+      const double y = x * x;
+      return x * y * y;
+    }
+    case 6: {
+      const double y = x * x;
+      return y * y * y;
+    }
+    case 7: {
+      const double y = x * x;
+      return x * y * y * y;
+    }
+    case 8: {
+      const double y = x * x;
+      const double z = y * y;
+      return z * z;
+    }
+  }
+}
+
+/**
+ * @brief Computes the power of x to the n for a (small) positive integer n.
+ *
+ * Only valid for values 0 <= n <= 8.
+ */
+__attribute__((const)) INLINE static int integer_powf(const float x,
+                                                      const unsigned int n) {
+
+#ifdef SWIFT_DEBUG_CHECKS
+  assert(n <= 8);
+#endif
+
+  switch (n) {
+    case 0:
+      return 1.f;
+    case 1:
+      return x;
+    case 2:
+      return x * x;
+    case 3:
+      return x * x * x;
+    case 4: {
+      const float y = x * x;
+      return y * y;
+    }
+    case 5: {
+      const float y = x * x;
+      return x * y * y;
+    }
+    case 6: {
+      const float y = x * x;
+      return y * y * y;
+    }
+    case 7: {
+      const float y = x * x;
+      return x * y * y * y;
+    }
+    case 8: {
+      const float y = x * x;
+      const float z = y * y;
+      return z * z;
+    }
+  }
+}
+
+#endif /* SWIFT_INTEGER_POWER_H */