diff --git a/gemma/ops.h b/gemma/ops.h
index 1ea800b..6401cc4 100644
--- a/gemma/ops.h
+++ b/gemma/ops.h
@@ -198,9 +198,9 @@ void GEMM_4x4_Static(const MatT* HWY_RESTRICT A, const MatT* HWY_RESTRICT B,
   constexpr int RM = 4;           // tile height
   constexpr int RN = 4;           // tile width
 
-  HWY_ASSERT(kM % RM == 0);
-  HWY_ASSERT(kColsA % N == 0);
-  HWY_ASSERT(kColsA % RN == 0);
+  static_assert(kM % RM == 0);
+  static_assert(kColsA % N == 0);
+  static_assert(kColsA % RN == 0);
 
   int lda = kColsA;
   int ldb = kColsA;  // n instead of k because we're transposing
@@ -242,11 +242,11 @@ HWY_NOINLINE void MatMul_4x4_Impl(const MatT* HWY_RESTRICT A,
   const int tiles = xtiles * ytiles;
 
   // 4x4 case requires kM % 4 == 0, kN % N == 0, kK % 4 == 0
-  HWY_ASSERT(kM % RM == 0);
-  HWY_ASSERT(kColsA % N == 0);
-  HWY_ASSERT(kColsA % RN == 0);
-  HWY_ASSERT(kK % RN == 0);
-  HWY_ASSERT(kColsA >= N);
+  static_assert(kM % RM == 0);
+  static_assert(kColsA % N == 0);
+  static_assert(kColsA % RN == 0);
+  static_assert(kK % RN == 0);
+  static_assert(kColsA >= N);
 
   // Handles a single 4x4 chunk, which is completed and then written into C.
   pool.Run(0, tiles, [&](const uint64_t chunk, size_t /*thread*/) HWY_ATTR {