diff --git a/src/pulsecore/sample-util.h b/src/pulsecore/sample-util.h
index 3d53ebe31..0732e8dc7 100644
--- a/src/pulsecore/sample-util.h
+++ b/src/pulsecore/sample-util.h
@@ -55,7 +55,7 @@ void pa_deinterleave(const void *src, void *dst[], unsigned channels, size_t ss,
 void pa_sample_clamp(pa_sample_format_t format, void *dst, size_t dstr, const void *src, size_t sstr, unsigned n);
 
 static inline int32_t pa_mult_s16_volume(int16_t v, int32_t cv) {
-#if HAVE_FAST_64BIT_OPERATIONS
+#ifdef HAVE_FAST_64BIT_OPERATIONS
     /* Multiply with 64 bit integers on 64 bit platforms */
     return (v * (int64_t) cv) >> 16;
 #else
diff --git a/src/tests/mult-s16-test.c b/src/tests/mult-s16-test.c
index 845e61c07..7340d8592 100644
--- a/src/tests/mult-s16-test.c
+++ b/src/tests/mult-s16-test.c
@@ -93,7 +93,7 @@ int main(int argc, char *argv[]) {
     if (!getenv("MAKE_CHECK"))
         pa_log_set_level(PA_LOG_DEBUG);
 
-#if HAVE_FAST_64BIT_OPERATIONS
+#ifdef HAVE_FAST_64BIT_OPERATIONS
     pa_log_debug("Detected CPU with fast 64-bit operations.");
 #else
     pa_log_debug("Not detected CPU with fast 64-bit operations.");