diff --git a/src/hdr_histogram.c b/src/hdr_histogram.c
index b2041f8..a5dd8d7 100644
--- a/src/hdr_histogram.c
+++ b/src/hdr_histogram.c
@@ -36,7 +36,7 @@
 
 /* Runtime-dispatched AVX2 path: keep the rest of this TU at the project's
    baseline ISA so the shipped binary does not silently require AVX2. */
-#if (defined(__x86_64__) || defined(_M_X64) || defined(__i386__) || defined(_M_IX86)) \
+#if (defined(__x86_64__) || defined(_M_X64)) \
     && (defined(__GNUC__) || defined(__clang__)) && !defined(__INTEL_COMPILER)
 #  define HDR_HAS_AVX2_DISPATCH 1
 #  include <immintrin.h>