diff --git a/flow/FastAlloc.cpp b/flow/FastAlloc.cpp
index 1935f5a9cb..7af1b3bf86 100644
--- a/flow/FastAlloc.cpp
+++ b/flow/FastAlloc.cpp
@@ -315,14 +315,14 @@ void* FastAllocator<Size>::allocate() {
 	}
 
 #if defined(USE_GPERFTOOLS) || defined(ADDRESS_SANITIZER)
-	// Some usages of FastAllocator<4096> require 4096 byte alignment
-	return aligned_alloc(Size == 4096 ? Size : alignof(void*), Size);
+	// Some usages of FastAllocator require 4096 byte alignment.
+	return aligned_alloc(Size >= 4096 ? 4096 : alignof(void*), Size);
 #endif
 
 #if VALGRIND
 	if (valgrindPrecise()) {
-		// Some usages of FastAllocator<4096> require 4096 byte alignment
-		return aligned_alloc(Size == 4096 ? Size : alignof(void*), Size);
+		// Some usages of FastAllocator require 4096 byte alignment
+		return aligned_alloc(Size >= 4096 ? 4096 : alignof(void*), Size);
 	}
 #endif