diff --git a/solenv/gbuild/platform/EMSCRIPTEN_INTEL_GCC.mk b/solenv/gbuild/platform/EMSCRIPTEN_INTEL_GCC.mk
index 4ae925daf5d1..a69539b65403 100644
--- a/solenv/gbuild/platform/EMSCRIPTEN_INTEL_GCC.mk
+++ b/solenv/gbuild/platform/EMSCRIPTEN_INTEL_GCC.mk
@@ -71,6 +71,8 @@ ifeq ($(HAVE_EXTERNAL_DWARF),TRUE)
 gb_DEBUGINFO_FLAGS += -gseparate-dwarf
 endif
 
+gb_COMPILEROPTFLAGS := -O3
+
 # We need at least code elimination, otherwise linking OOMs even with 64GB.
 # So we "fake" -Og support to mean -O1 for Emscripten and always enable it for debug in configure.
 gb_COMPILERDEBUGOPTFLAGS := -O1