diff --git a/package/opus/opus.mk b/package/opus/opus.mk
index 4f816df477..2fa929c7df 100644
--- a/package/opus/opus.mk
+++ b/package/opus/opus.mk
@@ -23,6 +23,10 @@ ifeq ($(BR2_PACKAGE_OPUS_FIXED_POINT),y)
 OPUS_CONF_OPTS += --enable-fixed-point
 endif
 
+ifeq ($(BR2_OPTIMIZE_FAST),y)
+OPUS_CONF_OPTS += --enable-float-approx
+endif
+
 # When we're on ARM, but we don't have ARM instructions (only
 # Thumb-2), disable the usage of assembly as it is not Thumb-ready.
 ifeq ($(BR2_arm)$(BR2_armeb):$(BR2_ARM_CPU_HAS_ARM),y:)