diff --git a/Makefile-gcc b/Makefile-gcc
index c07bf9b..12bf1ed 100644
--- a/Makefile-gcc
+++ b/Makefile-gcc
@@ -224,11 +224,13 @@
 # This is very uggerly.  Need to sed out both "xyzzyN" and
 # "xyzzy$N" since gcc on different targets emits the constants
 # differently -- with a leading $ on x86/amd64 but none on ppc32/64.
+# ICC also emits the constants differently with a leading # #define
 pub/libvex_guest_offsets.h:
 	rm -f auxprogs/genoffsets.s
 	$(CC) $(CCFLAGS) -O -S -o auxprogs/genoffsets.s \
 				auxprogs/genoffsets.c
-	grep xyzzy auxprogs/genoffsets.s | grep "^#define" \
+	grep xyzzy auxprogs/genoffsets.s | grep "^[# ]*#define" \
+	   | sed "s/# #define/#define/g" \
 	   | sed "s/xyzzy\\$$//g" \
 	   | sed "s/xyzzy#//g" \
 	   | sed "s/xyzzy//g" \