diff --git a/include/openmc/random_lcg.h b/include/openmc/random_lcg.h
index 518dedb455..350fa7d245 100644
--- a/include/openmc/random_lcg.h
+++ b/include/openmc/random_lcg.h
@@ -89,7 +89,7 @@ uint64_t future_seed(uint64_t n, uint64_t prn_seed);
 //! Get OpenMC's master seed.
 //==============================================================================
 
-int64_t openmc_get_seed();
+extern "C" int64_t openmc_get_seed();
 
 //==============================================================================
 //! Set OpenMC's master seed.
@@ -97,7 +97,7 @@ int64_t openmc_get_seed();
 //! one.
 //==============================================================================
 
-void openmc_set_seed(int64_t new_seed);
+extern "C" void openmc_set_seed(int64_t new_seed);
 
 } // namespace openmc
 #endif // OPENMC_RANDOM_LCG_H
diff --git a/src/random_lcg.cpp b/src/random_lcg.cpp
index 1aae8e89ac..b5feb2ef0c 100644
--- a/src/random_lcg.cpp
+++ b/src/random_lcg.cpp
@@ -113,9 +113,9 @@ uint64_t future_seed(uint64_t n, uint64_t prn_seed)
 //                               API FUNCTIONS
 //==============================================================================
 
-int64_t openmc_get_seed() {return master_seed;}
+extern "C" int64_t openmc_get_seed() {return master_seed;}
 
-void openmc_set_seed(int64_t new_seed)
+extern "C" void openmc_set_seed(int64_t new_seed)
 {
   master_seed = new_seed;
 }