diff --git a/include/cglm/simd/arm.h b/include/cglm/simd/arm.h
index 328c7e3..1a7c2ea 100644
--- a/include/cglm/simd/arm.h
+++ b/include/cglm/simd/arm.h
@@ -177,7 +177,7 @@ glmm_fmsub(float32x4_t a, float32x4_t b, float32x4_t c) {
 #if CGLM_ARM64
   return vfmsq_f32(c, a, b);
 #else
-  return vmlsq_f32(c, a, b);
+  return vmlsq_f32(vnegq_f32(c), a, b);
 #endif
 }