diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7d7339b..72ab7ce 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Cleanup westmere and haswell object files (#24) Thanks @fobser
 - Out of tree builds (NLnetLabs/nsd#415)
+- Fix function declarations for fallback detection routine in isadetection.h.
 
 ## [0.2.0] - 2024-12-12
 
diff --git a/src/isadetection.h b/src/isadetection.h
index f35f915..a7b5a03 100644
--- a/src/isadetection.h
+++ b/src/isadetection.h
@@ -87,7 +87,7 @@ enum instruction_set {
 
 #if defined(__PPC64__)
 
-static inline uint32_t detect_supported_architectures() {
+static inline uint32_t detect_supported_architectures(void) {
   return ALTIVEC;
 }
 
@@ -95,13 +95,13 @@ static inline uint32_t detect_supported_architectures() {
 
 #if defined(__ARM_NEON)
 
-static inline uint32_t detect_supported_architectures() {
+static inline uint32_t detect_supported_architectures(void) {
   return NEON;
 }
 
 #else // ARM without NEON
 
-static inline uint32_t detect_supported_architectures() {
+static inline uint32_t detect_supported_architectures(void) {
   return DEFAULT;
 }
 
@@ -260,7 +260,7 @@ static inline uint32_t detect_supported_architectures(void)
 }
 #else // fallback
 
-static inline uint32_t detect_supported_architectures() {
+static inline uint32_t detect_supported_architectures(void) {
   return DEFAULT;
 }