diff --git a/mozilla/security/nss/lib/freebl/Makefile b/mozilla/security/nss/lib/freebl/Makefile
index 17b87bb70b1..c5b5a129948 100644
--- a/mozilla/security/nss/lib/freebl/Makefile
+++ b/mozilla/security/nss/lib/freebl/Makefile
@@ -187,6 +187,7 @@ endif
 endif
 else
 # Solaris x86
+    DEFINES += -D_X86_
     DEFINES += -DMP_USE_UINT_DIGIT
     DEFINES += -DMP_ASSEMBLY_MULTIPLY -DMP_ASSEMBLY_SQUARE -DMP_ASSEMBLY_DIV_2DX1D
     ASFILES  = mpi_i86pc.s