diff --git a/build/parseSpec.c b/build/parseSpec.c
index d2ee92235..4993fffe8 100644
--- a/build/parseSpec.c
+++ b/build/parseSpec.c
@@ -203,7 +203,7 @@ static int copyNextLineFromOFI(rpmSpec spec, OFI_t *ofi)
 
 	/* Don't expand macros (eg. %define) in false branch of %if clause */
 	if (spec->readStack->reading &&
-	    expandMacros(spec, spec->macros, spec->lbuf, sizeof(spec->lbuf))) {
+	    expandMacros(spec, spec->macros, spec->lbuf, spec->lbufSize)) {
 		rpmlog(RPMLOG_ERR, _("line %d: %s\n"),
 			spec->lineNum, spec->lbuf);
 		return -1;
diff --git a/build/rpmbuild_internal.h b/build/rpmbuild_internal.h
index 50ddbe3a9..96f00288a 100644
--- a/build/rpmbuild_internal.h
+++ b/build/rpmbuild_internal.h
@@ -41,7 +41,8 @@ struct rpmSpec_s {
     const char * rootDir;
 
     struct OpenFileInfo * fileStack;
-    char lbuf[10*BUFSIZ];
+    char *lbuf;
+    size_t lbufSize;
     size_t lbufOff;
     char nextpeekc;
     char * nextline;
diff --git a/build/spec.c b/build/spec.c
index 00e4e6d3a..4b6b6805d 100644
--- a/build/spec.c
+++ b/build/spec.c
@@ -160,6 +160,8 @@ rpmSpec newSpec(void)
     spec->specFile = NULL;
 
     spec->fileStack = NULL;
+    spec->lbufSize = BUFSIZ * 10;
+    spec->lbuf = xmalloc(spec->lbufSize);
     spec->lbuf[0] = '\0';
     spec->line = spec->lbuf;
     spec->nextline = NULL;
@@ -237,6 +239,7 @@ rpmSpec rpmSpecFree(rpmSpec spec)
 	rl->next = NULL;
 	free(rl);
     }
+    spec->lbuf = _free(spec->lbuf);
     
     spec->sourceRpmName = _free(spec->sourceRpmName);
     spec->sourcePkgId = _free(spec->sourcePkgId);