diff --git a/src/swtpm/mainloop.c b/src/swtpm/mainloop.c
index d2d7bcce..74fc233f 100644
--- a/src/swtpm/mainloop.c
+++ b/src/swtpm/mainloop.c
@@ -40,6 +40,8 @@
    It reads a TPM request, processes the ordinal, and writes the response
 */
 
+#include <config.h>
+
 #include <errno.h>
 #include <stdio.h>
 #include <stdint.h>
diff --git a/src/swtpm/tpmlib.h b/src/swtpm/tpmlib.h
index 90f9cb86..48c5f198 100644
--- a/src/swtpm/tpmlib.h
+++ b/src/swtpm/tpmlib.h
@@ -38,6 +38,8 @@
 #ifndef _SWTPM_TPMLIB_H_
 #define _SWTPM_TPMLIB_H_
 
+#include <config.h> /* ensure consistent definition of _FILE_OFFSET_BITS */
+
 #include <stdint.h>
 #include <stdbool.h>