ECPG fails to handle hex constants

I stumbled across this bug yesterday. My compiler (gcc 2.95.3 on RedHat
6.2) was telling me

query.pgc:1383: character constant too long

so I compiled to query.c vs. query.o. I found that

if ( field->flags & 0x80000000 )
became
if ( field->flags & '0x80000000' )

after passing thru ecpg, although it does not appear inside any EXEC SQL
clauses. (field->flags is an 's32' which is typedef'd from int.)

I worked around this problem by thus

/* Do this else ECPG makes 0x80000000 a char */
#define MASK_HI_BIT 0x80000000
...
if ( field->flags & MASK_HI_BIT )

which leaves it all to the C preprocessor. But why should I have to?
Is this really a bug in ecpg?
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