diff --git a/lib/cf-socket.c b/lib/cf-socket.c
index 73b4fa857d..e90eddcc5a 100644
--- a/lib/cf-socket.c
+++ b/lib/cf-socket.c
@@ -942,7 +942,7 @@ static CURLcode socket_connect_result(struct Curl_easy *data,
   switch(error) {
   case SOCKEINPROGRESS:
   case SOCKEWOULDBLOCK:
-#if !defined(USE_WINSOCK) && defined(EAGAIN) && EAGAIN != SOCKEWOULDBLOCK
+#if !defined(USE_WINSOCK) && EAGAIN != SOCKEWOULDBLOCK
     /* On some platforms EAGAIN and EWOULDBLOCK are the
      * same value, and on others they are different, hence
      * the odd #if
diff --git a/lib/curl_setup.h b/lib/curl_setup.h
index c62a21fde7..9cda99ab88 100644
--- a/lib/curl_setup.h
+++ b/lib/curl_setup.h
@@ -1137,7 +1137,7 @@ typedef unsigned int curl_bit;
 #define SOCKEWOULDBLOCK   EWOULDBLOCK
 #endif
 
-#if !defined(USE_WINSOCK) && defined(EAGAIN) && EAGAIN != SOCKEWOULDBLOCK
+#if !defined(USE_WINSOCK) && EAGAIN != SOCKEWOULDBLOCK
 #define SOCK_EWOULDBLOCK_EAGAIN(e) ((e) == SOCKEWOULDBLOCK || (e) == EAGAIN)
 #else
 #define SOCK_EWOULDBLOCK_EAGAIN(e) ((e) == SOCKEWOULDBLOCK)
diff --git a/lib/vquic/vquic.c b/lib/vquic/vquic.c
index 5e8ae1fb08..c8bf9a086c 100644
--- a/lib/vquic/vquic.c
+++ b/lib/vquic/vquic.c
@@ -167,7 +167,7 @@ static CURLcode do_sendmsg(struct Curl_cfilter *cf,
   if(!curlx_sztouz(rv, psent)) {
     switch(SOCKERRNO) {
     case SOCKEWOULDBLOCK:
-#if !defined(USE_WINSOCK) && defined(EAGAIN) && EAGAIN != SOCKEWOULDBLOCK
+#if !defined(USE_WINSOCK) && EAGAIN != SOCKEWOULDBLOCK
     case EAGAIN:
 #endif
       return CURLE_AGAIN;
diff --git a/lib/vtls/rustls.c b/lib/vtls/rustls.c
index f780179000..b598a174fb 100644
--- a/lib/vtls/rustls.c
+++ b/lib/vtls/rustls.c
@@ -45,7 +45,7 @@
 #include "curlx/base64.h"
 #endif
 
-#if defined(EAGAIN) && EAGAIN != SOCKEWOULDBLOCK
+#if EAGAIN != SOCKEWOULDBLOCK
 #define RAW_EWOULDBLOCK_EAGAIN(e)  ((e) == EWOULDBLOCK || (e) == EAGAIN)
 #else
 #define RAW_EWOULDBLOCK_EAGAIN(e)  ((e) == EWOULDBLOCK)