diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 7aebd0f59..ff4795a7e 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -172,6 +172,7 @@ jobs:
           submodules: 'true'
       - name: Install dependencies
         run: |
+          sudo apt-get -y update
           sudo apt-get install -y gfortran rpm mpich libmpich-dev libhwloc-dev gdb
           sudo sysctl -w kernel.yama.ptrace_scope=0
           sudo sysctl -w kernel.randomize_va_space=0
@@ -219,7 +220,7 @@ jobs:
         if: ${{ matrix.xpmem_version }}
         run: |
           cd repos/xpmem
-          sudo apt-get install linux-headers-`uname -r`
+          sudo apt-get -y install linux-headers-`uname -r`
           ./autogen.sh
           ./configure --prefix=${XPMEM_INSTALL_DIR}
           make -j
@@ -332,6 +333,7 @@ jobs:
 #      - uses: actions/checkout@v2
 #      - name: Install dependencies
 #        run: |
+#          sudo apt-get -y update
 #          sudo apt-get install -y gfortran libhwloc-dev libev-dev libev-libevent-dev
 #
 #      # LIBFABRIC
@@ -531,6 +533,7 @@ jobs:
           submodules: 'true'
       - name: Install dependencies
         run: |
+          sudo apt-get -y update
           sudo apt-get install -y gfortran mpich libmpich-dev gdb
           sudo sysctl -w kernel.yama.ptrace_scope=0
           sudo sysctl -w kernel.randomize_va_space=0
@@ -545,7 +548,7 @@ jobs:
       - name: Build XPMEM
         run: |
           cd repos/xpmem
-          sudo apt-get install linux-headers-`uname -r`
+          sudo apt-get -y install linux-headers-`uname -r`
           ./autogen.sh
           ./configure --prefix=/usr
           make -j
@@ -648,6 +651,7 @@ jobs:
           submodules: 'true'
       - name: Install dependencies
         run: |
+          sudo apt-get -y update
           sudo apt-get install -y gfortran mpich libmpich-dev libev-dev libev-libevent-dev libhwloc-dev gdb
           sudo sysctl -w kernel.yama.ptrace_scope=0
           sudo sysctl -w kernel.randomize_va_space=0
@@ -662,7 +666,7 @@ jobs:
       - name: Build XPMEM
         run: |
           cd repos/xpmem
-          sudo apt-get install linux-headers-`uname -r`
+          sudo apt-get -y install linux-headers-`uname -r`
           ./autogen.sh
           ./configure --prefix=/usr
           make -j
@@ -744,6 +748,7 @@ jobs:
           submodules: 'true'
       - name: Install dependencies
         run: |
+          sudo apt-get -y update
           sudo apt-get install -y gfortran mpich libmpich-dev libev-dev libev-libevent-dev libhwloc-dev gdb
           sudo sysctl -w kernel.yama.ptrace_scope=0
           sudo sysctl -w kernel.randomize_va_space=0
@@ -758,7 +763,7 @@ jobs:
       - name: Build XPMEM
         run: |
           cd repos/xpmem
-          sudo apt-get install linux-headers-`uname -r`
+          sudo apt-get -y install linux-headers-`uname -r`
           ./autogen.sh
           ./configure --prefix=/usr
           make -j
diff --git a/src/shmem_atomic.h b/src/shmem_atomic.h
index 7fc35cccc..12a34599f 100644
--- a/src/shmem_atomic.h
+++ b/src/shmem_atomic.h
@@ -164,6 +164,11 @@ shmem_internal_cntr_dec(shmem_internal_cntr_t *val) {
     return;
 }
 
+static inline
+uint64_t
+shmem_internal_cntr_fadd(shmem_internal_cntr_t *ptr, uint64_t value) {
+    return __atomic_fetch_add(ptr, value, __ATOMIC_RELEASE);
+}
 #    else /* HAVE_STDATOMIC_H */
 
 #include <stdatomic.h>
@@ -197,6 +202,11 @@ shmem_internal_cntr_dec(shmem_internal_cntr_t *val) {
     return;
 }
 
+static inline
+uint64_t
+shmem_internal_cntr_fadd(shmem_internal_cntr_t *ptr, uint64_t value) {
+    return atomic_fetch_add(ptr, value);
+}
 #    endif
 #  else /* !define( ENABLE_THREADS ) */
 
@@ -228,6 +238,14 @@ shmem_internal_cntr_dec(shmem_internal_cntr_t *val) {
     *val = *val-1;
     return;
 }
+
+static inline
+uint64_t
+shmem_internal_cntr_fadd(shmem_internal_cntr_t *ptr, uint64_t value) {
+    uint64_t orig_value = *ptr;
+    *ptr = *ptr + value;
+    return orig_value;
+}
 #  endif /* ENABLE_THREADS */
 
 #endif