diff --git a/src/physics.cpp b/src/physics.cpp
index c744d0f4c..f0228ac4e 100644
--- a/src/physics.cpp
+++ b/src/physics.cpp
@@ -205,7 +205,7 @@ create_fission_sites(Particle& p, int i_nuclide, const Reaction& rx)
       int64_t idx = simulation::fission_bank.thread_safe_append(site);
       if (idx == -1) {
         warning("The shared fission bank is full. Additional fission sites created "
-            "in this generation will not be banked. Results may be non-deteministic.");
+            "in this generation will not be banked. Results may be non-deterministic.");
 
         // Decrement number of particle progeny as storage was unsuccessful. This
         // step is needed so that the sum of all progeny is equal to the size
diff --git a/src/physics_mg.cpp b/src/physics_mg.cpp
index 7eb594e9b..1d47bac0d 100644
--- a/src/physics_mg.cpp
+++ b/src/physics_mg.cpp
@@ -164,7 +164,7 @@ create_fission_sites(Particle& p)
       int64_t idx = simulation::fission_bank.thread_safe_append(site);
       if (idx == -1) {
         warning("The shared fission bank is full. Additional fission sites created "
-            "in this generation will not be banked. Results may be non-deteministic.");
+            "in this generation will not be banked. Results may be non-deterministic.");
 
         // Decrement number of particle progeny as storage was unsuccessful. This
         // step is needed so that the sum of all progeny is equal to the size